Tom hid himself behind the door, _______ he rushed out to scare his mother.
They seemed ______ each other for a long time.
This is Mr. Smith. _______ help I worked out many difficult problems.
---I’d like to buy a new computer.---Well, we have several models __________.
_______ to take this advance course will certainly learn a lot of useful skills.
We all made him ________ head of our class.