Grammar 答案：
一、1. in celebration of 2. log off 3. some day 4. cultural differences
5. participate in 6. adjust to sth 7. when it comes to this topic 8. take up
9. give presents to sb 10. shake hands(with sb)
二、
时间 If 条件句（谓语动词形式） 主句（谓语动词形式）
现在 过去式/be(were) would/should…do
1. were , would work; 2. had, would want
3. If my bother were here, everything would go well.
4. C
三、
时间 If 条件句（谓语动词形式） 主句（谓语动词形式）
过去 had done Would/should…have done
1. had been, would have passed; 2. had met, would have gone
3. If you had come earlier, you would have met him.
4. BDA
四、
时间 If 条件句（谓语动词形式） 主句（谓语动词形式）
将来 过去式/should do/were
to do
Would/should do
1. happened/should happen/ were to happen, would get up
2. controlled/should control/ were to control, would be
3. If it were Sunday tomorrow, I would go to visit my grandmother.
4. B
五、
DBAC
当堂检测：
CBCBD BCACD D
时间 If 条件句（谓语动词形式） 主句（谓语动词形式）
现在 过去式/be(were) would/should…do
过去 had done Would/should…have done
将来 过去式/should do/were
to do
Would/should do
省略 if 把 had、were、should 等提到句首，用倒装语序
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