选择适当的词语替换句子中的划线部分。
1. Tom walks to school every day.
A. on foot
B. goes to
C. goes to … on foot
2. There are over 50 students in our class.
A. about
B. more than
C. around
3. We had a good time in the park yesterday.
A. enjoyed myself
B. have fun
C. enjoyed ourselves.
4. The summer holiday goes on from July to September.
A. starts
B. takes
C. lasts
5. I got a letter from my friend last week.
A. received from
B. heard from
C. heard a letter from
