Only when class began _______that he had left his book at home.
| A．will he realize | B．he did realize |
| C．did he realize | D．should he realize |
Playing on the football pitch __________.
| A．some students are with their P. E. teacher |
| B．their P. E. teacher is with some students |
| C．some students with their P. E. teacher are |
| D．are some students with their P. E. teacher |
With the development of the Internet, e-mail has largely __________ the traditional business letter.
| A．exchanged | B．reduced |
| C．replaced | D．traded |
I won't buy this iPhone unless the price __________ to under 2，000 yuan.
| A．reduces | B．will be reduced |
| C．has reduced | D．is reduced |
Since we have made __________，we have to make __________ to achieve more.
| A．a progress; efforts | B．progresses; an effort |
| C．much progress; effort | D．little progress; efforts |
Now many people move into cities in order to have their children __________.
| A．better educate | B．receive well education |
| C．better educated | D．accept better education |