By the time Jack returned home from England，his son ________ from college.(2011·辽宁)
| A．graduated | B．has graduated |
| C．had been graduating | D．had graduated |
Under no circumstances and at no time __________be the first______ nuclear weapons.
| A．we shall; using | B．shall we; to use | C．shall we; used | D．we shall; using |
He hurried home, only to find his house __________.
| A．break out | B．broken into | C．break into | D．break in |
The government have realized the use the returnees make ______ the experience and skills ________while living abroad.
| A．of; gained | B．of; gain | C．for; gained | D．up; gain |
Food aid______ is not enough to ______ the problem _______ now.
| A．only; solve; discussed | B．alone; solving; being discussed |
| C．merely; solving; being discussed | D．alone; solve; being discussed |
People ran out __________ as fire tore through the building.
| A．with vain | B．in rags | C．with one voice | D．in terror |