When you visit the room, the electronic facilities in it can___and recognize you.
A. interview
B. identify
C. instruct
D. introduce
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You___have come to the concert. It was excellent.
A. may
B. need
C. ought to
D. must
Lowering personal production of waste___everyone over the past decade.
A. benefited
B. has benefited
C. benefits
D. benefiting
The problem of global warming___for decades.
A. has been existed
B. has existing
C. being existed
D. has existed
Let everybody___something to reduce environmental pollution.
A. do
B. to do
C. doing
D. do it
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