He is __________ coming late.
A. sometimes
B. usually
C. constantly
D. often
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We refuse to sign any treaty(条约) that is against our __________ interests.
A. national
B. nation
C. nationality
D. nationalist
We’re very much __________ that he lost the game.
A. mistaken
B. disappointed
C. distrusted
D. concentrated
This watch is made __________.
A. up of gold
B. of gold
C. from golden
D. of golden
The students are working on the problem __________.
A. in groups
B. on group
C. individual
D. every one