This work ___ much patience.
| A．calls at | B．calls up | C．calls for | D．calls on |
We have been told that under no circumstances ______ the telephone in the office for personal affairs.
| A．may we use | B．we may use | C．we use | D．do we use |
—Tom is so worried about the test that he said he was going to study all night.
—Tell him he should quit ______ and get some help.
| A．to have worried | B．to worry | C．worrying | D．from worrying |
John didn’t feel well yesterday; otherwise he ______ to see his friend off at the airport.
| A．came | B．would come | C．would have come | D．should be coming |
_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
| A．Now that | B．Ever since | C．So that | D．As long as |
Before the first nonstop flight made in 1949, it_____ necessary for all planes to land for refueling.
| A．would be | B．has been | C．had been | D．would have been |