The government has taken some measures to reconstruct the earthquake-hit areas, but it must be some time ________ everything returns to normal.
| A．since | B．after | C．unless | D．before |
_____ is well known to the world is that China has very top technology in space industry．
| A．It | B．As | C．What | D．Which |
With two children _____ high school, the farmer couple have to work from morning till night．
| A．attended | B．being attended | C．attend | D．attending |
—You seem to have had a wonderful winter holiday!
—Yes．Really warm days during the Spring Festival．My parents and I _____ to several tourist spots．
| A．are driving | B．drove |
| C．have been driving | D．will drive |
Many people think any government's work should be evaluated ______ on citizens' happiness level．
| A．based | B．to be based | C．basing | D．being based |
Growing up _____ be difficult, for you will come across many things that confuse you．
| A．can | B．should | C．must | D．shall |