Tom's old computer ran fast five years ago，but little by little it really slow．（ ）
| A． |
looked |
B． |
became |
C． |
sounded |
D． |
stayed |
He _____ when the UFO arrived.
| A．was sleeping | B．were sleeping |
| C．has slept | D．is asleep |
The teacher said that they ______ hard-working students.
| A．is | B．are | C．were | D．was |
His father _____ to Nanjing. He _____ back next week.
A. has been, is B has been, will be
C. has gone, is D. has gone, will be
The teacher encourages her students ____ English as much as possible.
| A．to speak | B．speaking | C．speak | D．spoke |
I will stay at home and read books if it _______ tomorrow.
| A．is raining | B．rains | C．rain | D．will rain |