I. 1.to, 2. with
II.
1. fewer thành less
2. weeks thành week
3. travel thành traveling.
III.
1. What is her son going to do?
IV.
1. We haven't met each other for 20 years.
2. Most children are interested in the book.
V.
1. importance.
Chúc bạn học tốt!!!