He had a lot of friends, only a few of ______ were invited to his wedding.
| A．whom | B．them | C．which | D．who |
Never form the habit of smoking because it ______ human beings.
| A．does harm with | B．is harmful to | C．is harm for | D．does harmful to |
—It is rather cold here. Shall we light a fire?
—No, we ______because things are easy to catch fire.
| A．won’t | B．can’t | C．mustn’t | D．needn’t |
It is said that his health ______ by years of hard working.
| A．has been destroyed | B．has destroyed | C．is destroying | D．had been destroyed |
Does everyone know what to do if a fire ______?
| A．is broken up | B．breaks up | C．is broken out | D．breaks out |
It is obvious _________ he has known the news and he is very satisfied with the result.
| A．which | B．that | C．what | D．whether |