The trees must _______three times a week.
You have failed two tests.You’d better start working harder,_______ you won’t pass the course.
The new group of students is better-behaved than the other group who stayed here _____.
He is a student at Oxford University,_______ for a degree in computer science.
—Excuse me sir,where is Room 301?—Just a minute.I’ll have Bob _______ you to your room.
He has made a lot of films,but _______ good ones.