—Did you arrive here this morning?
—Yes,it was at nine o’clock ____we came here.
| A．when | B．before |
| C．which | D．that |
—You were brave enough to argue with Mr. Smith. —Well, now I regret _______ that.
| A．to do | B．to be doing | C．to have done | D．having done |
Too much pressure from study leads to sleeplessness, which _______ increases the risk of forgetfulness.
| A．in turn | B．in return | C．by chance | D．by choice |
The gym is a public place, so you should be ________ and leave all the machines clean after using them.
| A．considerate | B．cautious | C．subtle | D．modest |
The ability to _____ one another for past wrongs is one of the greatest attributes that anyone should possess or exercise.
| A．explain | B．forgive | C．excuse | D．apologize |
They were close ______ each other in high school and now are still ______ touch.
| A．to; with | B．to; in | C．with; in | D．with; with |