填空：
1.竹子可以制成许多有用的东西．
Bamboo can_____ _____ _____many_____ _____useful things.
2.我两天前收到的这封来信是我姨妈寄来的．
The letter_____ _____2 days ago_____ _____my aunt.
3.钟是一种能报时的机器．
A clock is a_____ _____ _____the people_____ _____.
How to do them.Thanks.
參考答案:1. be made into, kinds of
2. I got/received, was from
3. machine to tell, the time
