Selecting a proper personal computer is no easy task because technology _____ so rapidly.
A will change B will have changed C is changing D has changed
Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?
| A．that; where | B．when; where | C．that; when | D．when; that |
A ______ person always tries to finish the job, no matter how hard it is.
| A．stubborn | B．determined | C．reliable | D．remarkable |
---Look! The telephone is broken. Someone damaged it ________ purpose.
---That may be right. But perhaps it was broken _________ accident.
| A．on; by | B．by; by | C．on; on | D．by; on |
— Oh! Must you? Stay a bit longer, please.
—, but I've got an early start tomorrow.
| A．No problem | B．All right | C．Thanks anyway | D．Never mind |
If they had known what was coming next, they __ their mind.
| A．may change | B．could change | C．must have changed | D．might have changed |