She can’t help ______ the house because she’s busy making a cake.
| A．to clean | B．cleaning | C．cleaned | D．being cleaned |
For some time now, world leaders _____ out the necessity for agreement on arms reduction.
| A．had been pointing | B．were pointing | C．have been pointing | D．pointed |
Have you ever been in a situation _____ you know the other person is right yet you cannot agree with him?
| A．by which | B．that | C．in where | D．where |
You _____ Jim anything about it. It was none of his business.
| A．needn’t have told | B．needn’t tell | C．mustn’t have told | D．mustn’t tell |
Professor Johnson is said _____ some significant advance in his research in the past year.
| A．having made | B．making | C．to have made | D．to make |
—You must obey every word of mine!
— _____ I don’t?
| A．How about | B．What if | C．So what | D．What about |