Many more trees should ____ this year.
Jenny enjoys reading and spends a lot of money on books __ she is not rich.
Take a boat trip, ________ you will be attracted by the beauty of the Li River.
Don’t leave your seat ________ all the papers have been collected by the teacher.
Mr. White can always make us relaxed. He is _________ teacher I have ever met.
Both of my sisters are teachers. One is a Chinese teacher, and ________ teaches English.