By the time Jack returned home from England, his son __________ from college.
| A．graduated |
| B．has graduated |
| C．had been graduating |
| D．had graduated |
Idon’tthink______possibletomasteraforeignlanguagewithoutmuchmemorywork.
| A．that | B．which | C．it | D．this |
______forsometimeafteratiringdayisveryenjoyableandexcitingformeinsummer.
ASwimB.SwimmingC.Goswimming D.Toswim
We believe scientists will ________a way to solve the problem of air pollution.
| A．set off | B．put off | C．come up with | D．catch up with |
Hiswife______hischildrenwasinvitedtotheparty.
| A．and | B．or | C．aswellas | D．butalso |
—What’s the matter _______Mike? He is wet through.
—His car ran _______the river.
| A．with, into | B．for, in | C．with, to | D．to, at |