----When does your mother go shopping?----Usually _____ Sunday morning.
| A．on | B．in | C． at | D．after |
You stand in line while waiting for the bus.
| A．mustn’t | B．can’t | C．are supposed to | D．don’t |
By the time he arrived at the airport, the plane .
| A．has taken off | B．was taking off | C．would take off | D．had taken off |
The boy was seen on the sports ground.
| A．to play | B．play | C．played | D．to playing |
I went to the city, but my parents at home.
| A．got | B．remained | C．staying | D．remaining |
Mary called me to come to the party, but she herself didn’t .
| A．show around | B．show up | C．come out | D．put up |