. The reason why I have to go is _____ if I don’t.
Miss Li has taught ____ English for about 3 years.—You are lucky. ____ is a very good teacher.
It won’t be a very long time _________ he is in business for himself.
Is this ______ English book?—No. ______ is at home.
Must I go through the radiation (辐射) check when I come back from Japan at the airport these days?—Yes, you ______.