1 . ________the message in advance, he wouldn’t have been late for the meeting.

A．Had he received	B．Has he received
C．Did he receive	D．Would he receive

2 . ________(catch) the morning train, he would not have been late for the meeting.

3 . If you had told him the truth, he might have made some suggestions. (句型转换)
             you            him the truth, he might have made some suggestions.

5 . He _____ his potential had it not been for his desire to meet new challenges.

A．would never have realized	B．would never realize
C．never realized	D．had never realized

6 . We would have won if we had trained harder.（句型转换）
___________ we __________ harder, we would have ___________.

7 . ________the governments and scientists not worked together，AIDS－related deaths_______since their highest in 2005.
如果政府和科学家不共同努力，艾滋病相关的死亡就不会从2005年的最高点下降。

8 . ________ it rain tomorrow, we wouldn’t go to the park.

9 . Had you come here earlier, you would have seen him. (英译汉）

10 . It seems that we have to accept the result and make a good preparation to have another try.
                      earlier, I could have done something to avoid this accident. (inform)
看来我们必须接受这个结果并做好再次尝试的准备了。要是我早点得知的话，就可以做些什么来避免这场事故了。