IV.

1.Although they have very little money,they are happy.

2.The weather was bad,so we didn't enjoy our holiday.

3.Because Lan was very lazy,she didn't pass the English exam.

4.Although he is very tired,he has to finish his homework.

5.If you don't keep silent,you will wake the baby up.

6.If he doesn't take these pills,he won't be better.

7.How about using tree leaves to wrap things?

 8.My father and my mother suggest that I should study hard in the next semester.

V.

1.What about organizing a show to raise money?

2.A building which was destroyed in the fire has now been rebuilt.

3.People are worried that the oil will pollute the sea.

4.The boy whom I helped yesterday was very poor.

5.I suggest that we should raise some money for poor children.

6.

Study well!