1 leave (have to +动词原形)
2 them (them 指代他的父母)
3 write(因为他是个 writer)
4 took(过去时态)
5 reading(like+动词的ing形式,表示:喜欢做谋事)
6 from (来源于生活)
7 give (mice是mouse的复数.意思是老鼠.句意:如果我们给老鼠牛的胃.)
8 grass (假设老鼠有了牛的胃,那老鼠就应该吃草)
9 different (different cities 不同的城市)
10 children (应该用复数)