【推荐3】I know _________ (为什么我们不应该在这里大声喊叫).

【推荐2】

A.caught        B. are       C. spend     D. for        E. takes

1. I ______ three hours studying English.
2. There ______ some bikes behind the tree.
3. I will stay in China ______ three days.
4. It ______ me two hours to go to the rest park.
5. I ______ a cold yesterday.

【推荐2】用①could, ②couldn’t, ③can或④can’t填空。(填序号)
1. He ______ run fun fast twenty years ago. Now he is old and he ______ run fast.
2. Now she is a singer. She ______ sing well.
3. I ______ read or write last year. But now I ______ read and write.
4. My brother is only three years old now. He ______ help my mother.
5. She became blind, but she ______ write books and travel all over the world now.