My friends and I are going out for a picnic tomorrow．
______．（ ）
A．My pleasure．B．Have a good time!
C．Help yourselves．
The mobile phone in 1973．（ ）
A．inventsB．is invented
C．inventedD．was invented
Lily is my classmate．We each other since she came to our school．（ ）
A．knowB．knewC．have knownD．will know
My mother some washing when the telephone rang．（ ）
A．doesB．didC．is doingD．was doing
﹣﹣﹣How do you usually go to school？
﹣﹣﹣I to school on foot．（ ）
A．goB．wentC．was goingD．will go
﹣﹣﹣ I hand in the report today？
﹣﹣﹣No，you needn't．（ ）
A．CanB．MustC．ShallD．Could