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美国人甘特在20世纪20年代提出的( )形象、直观，且易于编制和理解，因而长期以来被广泛应用于建设工程进度控制之中。
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Not having a good command of English can be a serious ______ preventing you from achieving your goals.
Large modern cities are too big to control. They impose their own living conditions on the people who inhabit them. City-dwellers are obliged by their environment to adopt a wholly unnatural way of life. They lose touch with the land and rhythm of nature. It is possible to live such an air-conditioned existence in a large city that you are barely conscious of the seasons. A few flowers in a public park (if you have time to visit it) may remind you that it is spring or summer. A few leaves clinging to the pavement may remind you that it is autumn. Beyond that, what is going on in nature seems totally irrelevant. All the simple, good things of life like sunshine and fresh air are at a premium(珍贵). Tall buildings blot out the sun. Traffic fumes pollute the atmosphere.Even the distinction between day and night is lost. The flow of traffic goes on unceasingly and the noise never stops. It's not easy to see much difference between day and night because （）
High oil prices have not yet produced an economic shock among consuming countries, but further rises, especially sharp (1) , would undoubtedly hurt the world economy, and (2) would inevitably harm producers, too. Beyond this obvious point, (3) , higher prices could even do harm to both oil firms and producers.Big oil firms (4) rolling in money today, but that disguises the fact that their longer-term prospects are (5) . Behind the reserves-accounting scandal at Royal Dutch/ Shell (6) a problem bedevilling all of the majors: replacing their dwindling reserves. (7) existing fields in Alaska and the North Sea are rapidly declining, OPEC countries and Russia are (8) them out. (9) they are to survive in the long term, the big oil firms must embrace other sources of energy (10) oil.(11) it is to believe, higher oil prices could be bad news for producing countries (12) . Political leaders in Russia, Venezuela and other oil-rich countries are bending laws to crack (13) on foreign firms and to strengthen their grip on oil (14) through state-run firms. This may be convenient for the political leaders themselves. Alas, it is (15) to do much for their countrymen. For years corruption and inefficiency (16) the typical results of government control of oil resources.Producing countries should (17) embrace open markets. (18) one thing, shutting out foreign investment will only hurt their own oil output by (19) the sharpest managers and latest technologies. For another, economic liberalisation (including reform of bloated welfare states) would help OPEC countries (20) their economies--as the NAFTA trade deal has done for oil-rich Mexico--and so prepare them for the day when the black gold starts running out. 14（）
High oil prices have not yet produced an economic shock among consuming countries, but further rises, especially sharp (1) , would undoubtedly hurt the world economy, and (2) would inevitably harm producers, too. Beyond this obvious point, (3) , higher prices could even do harm to both oil firms and producers.Big oil firms (4) rolling in money today, but that disguises the fact that their longer-term prospects are (5) . Behind the reserves-accounting scandal at Royal Dutch/ Shell (6) a problem bedevilling all of the majors: replacing their dwindling reserves. (7) existing fields in Alaska and the North Sea are rapidly declining, OPEC countries and Russia are (8) them out. (9) they are to survive in the long term, the big oil firms must embrace other sources of energy (10) oil.(11) it is to believe, higher oil prices could be bad news for producing countries (12) . Political leaders in Russia, Venezuela and other oil-rich countries are bending laws to crack (13) on foreign firms and to strengthen their grip on oil (14) through state-run firms. This may be convenient for the political leaders themselves. Alas, it is (15) to do much for their countrymen. For years corruption and inefficiency (16) the typical results of government control of oil resources.Producing countries should (17) embrace open markets. (18) one thing, shutting out foreign investment will only hurt their own oil output by (19) the sharpest managers and latest technologies. For another, economic liberalisation (including reform of bloated welfare states) would help OPEC countries (20) their economies--as the NAFTA trade deal has done for oil-rich Mexico--and so prepare them for the day when the black gold starts running out. 5（）
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