— Who helped Mark with his English?— _______, he taught himself.
Don’t ______ Frank to come and visit grandma. He is so busy these days.
—______ do you think ____ the environment (环境) in Yichun?—It’s pretty good.
In fact, her persistance(坚持) is one of the ____ why Tu Youyou won the Nobel Prize.
—Which of the two magazines will you take?—I’ll take ____. One is for my sister and the other is for my brother.
Class Two, Grade Eight did ____ in the sports meeting last month. No class got ____ points than them.