To get an education, _______.
| A．working hard is very important | B．working hard is needed |
| C．one must work hard | D．it is needed to work hard |
He advised farmers to choose the best seed-heads ,__________ that had the best color .
| A．不填 | B．ones | C．this | D．the ones |
Great changes have taken place in that factory. It is no longer _________
it was 20 years ago,_____ it was so poorly equipped.
| A．what ,when | B．that ,which | C．what ,which | D．which ,that |
When first __________to the market ,these products enjoyed great success .
| A．introducing | B．introduced | C．to introduce | D．being introduced |
__ It is so late. Our son __________ be back .
__ Don’t worry . I dare say he ________ have some extra work to do.
| A．can ; must | B．will ; might | C．should ; must | D．must ; may |
__ Any suggestions?
__ You’d better ______________ the last sentence as it is rather misleading.
| A．put out | B．leave out | C．point out | D．pick out |