Teachers should keep students _______ a distance, but not _______ the distance.
| A．at; in |
| B．in; in |
| C．at; at |
| D．in; at |
His singing career began to ______ in the late 1990s.
| A．get off | B．take off | C．put off | D．set off |
I hate ______ when the weather becomes freezing cold because there is no heater inside.
| A．this | B．that | C．it | D．so |
Is this the first time you_______ Beijing?
| A．have visited | B．was visiting |
| C．visited | D．has visited |
— Father, you promised!
— Well, ________. But it was you who didn’t keep your word first.
| A．So was I. | B．So did I. | C．So I was. | D．So I did. |
Hurry up﹗The train ______. You know it ______ at 9:00 am.
| A．leaves; leaves | B．leaves; is leaving |
| C．is leaving; leaves | D．is leaving; is leaving |