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．had he realized |
．The 8．8 quake in central Chile caused widespread damage, destroying lost of buildings and hundreds of thousands Of people__________ ．
| A．to affect | B．affecting | C．affect | D．affected |
．The International Day against Drugs, aimed at warning people to keep away from drugs， _________ on June 26th every year．
| A．taking place | B．takes place | C．took place | D．taken place |
Mary failed the driving test again．If she _________ harder, she __________ the test easily．
| A．practiced; would pass | B．had practiced; would pass |
| C．had practiced; would have passed | D．shodd practice; should have passed |
Obama says he is angry about policies that always favor the wealthy and powerful over
__________ Americans and Insists that opportunities be opened up to all．
| A．average | B．intelligent | C．competitive | D．original |
__________ it is true that a student`s most important goal is to do well in his or her studies，it doesn`t need to be the only goal．
| A．When | B．As | C．While | D．Before |