We all know that we ________ our carbon footprint, but I suspect that many people wouldn't be prepared to go as far as Joan Pick, a retired scientist living in south London.
| A．must have reduced | B．should have reduced |
| C．may have reduced | D．could have reduced |
It is widely accepted reported in the western media that the drug ______ is now becoming a leading cause of teenager crimes.
| A．adoption | B．abuse | C．appreciation | D．appeal |
“Boys and girls, you are asked to submit a(n) _______ of about 100 words of the lecture given by Professor Yu tomorrow” , said the teacher.
| A．impression | B．report | C．abstract | D．conclusion |
The windows _____, so you need not wash it again.
| A．is washed | B．was washed | C．have been washed | D．will be washed |
She doesn’t speak ____ her friend, but her written work is excellent.
| A．as well as | B．so often as | C．as much as | D．as good as |
---- How long ____ at this job?
---- Since 1990.
| A．were you employed | B．have you been employed |
| C．had you been employed | D．will you be employed |