1. Remember to clean the room. (改为同义句)
    _______ _______ to clean the room.
2. The red dress is 100 dollars, and that white one is 90 dollars. (同义句)
   The white dress is _______ than that red one.
3. Jim has to help his mother do the housework. (改为否定句)
    Jim _______ _______ to help his mother do the housework.
4. Lin Tao often does the dishes on Sunday. (用next Sunday改写)
    Lin Tao _______ _______ the dishes next Sunday.
5.They did their homework last night. (改为否定句)
   They _______ _______ their homework last night.
6. He went camping last week. (对画线部分提问)
   _______ _______ he _______ camping?
7. We need one teaspoon of honey. (对画线部分提问)
    How _______ _______ do you need?
8. The boys are going to take part in the speech contest. (对画线部分提问)
    _______ _______the boys going _______ _______.
9. The talented boy went to primary school when he was only four. (同义句)
    The talented boy went to primary school _______ _______ _______ _______ four.
10. He is so young that he can't go to school. (同义句)
     He is _______ young _______ go to school.

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A. may
B. could
C. must