用所给单词的适当形式填空。l. The tree house is used t
题型：填空题
问题：
| 用所给单词的适当形式填空。 |
| l. The tree house is used to keep the rain from _____ (fall) on the bird's nest. 2. On Children's Day, parents usually spend some money _____ (buy) gifts for their children. 3. Mr. Wang seemed _____ (know) what was going on atthat time. 4. It may be _____ ( lone) to live _____ ( lone) . 5. He is afraid _____ ( climb) the hill himself. |