Everyone here will thank the firefighter for the things they have done to prevent fires______the environment safer.
| A．make | B．to making | C．to make | D．from making |
Obviously, he _____ a bad cold. He coughs all the time.
| A．has | B．is having | C．will have | D．was |
He seized me by the hand and _____ let me go.
| A．does not | B．did not | C．would not | D．had not |
--- One of you will have to go there besides me.
--- Who would you rather _____ there with you. Tom or I?
| A．have to go | B．to go | C．went | D．go |
Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.
| A．is, in that | B．are, in that | C．is, in which | D．are, at that |
Robert is said _____ abroad, but I don’t know what country he studied in.
| A．to have studied | B．to study | C．to be studying | D．to have been studying |