If _____ carefully, the experiment will be successful.
| A．do | B．does | C．done | D．doing |
Not until the train pulled into the station that his suitcase was gone.
| A．did he find | B．had he found | C．he had found | D．he found |
This is the best way ______ I have thought of ______ the problem.
| A．that; solving | B．in which; solving |
| C．which; to solve | D．/; to solve |
However difficult you find to arrange your time, it will pay off in the long run.
| A．this | B．one | C．it | D．that |
Walter offered us a lift when he was leaving the office, but our work ______, we didn’t accept the offer.
| A．not being finished | B．having not been finished |
| C．had not been finished | D．not having finished |
ThejobprovedtobemuchmoredifficultthanI______.
| A．expect | B．expected | C．wouldexpect | D．hadexpected |