What a pity! Considering his ability and experience, he better.need have done B.must have done C.can have done D.might have done
Judging from his face_______ there was a confident smile, we knew that he didn’t lose heart.
As the quality of the city’s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.
Tom’s score on the test is the highest in the class. He _____.
I’m afraid I’m not ________ to help with the talent show, for I am fully occupied with my own project.
--- Do you think it is hot today? ---_______ , but not as hot as yesterday.