Gun control is a subject ________ Americans have argued for a long time. (2009 .陕西)
| A．of which |
| B．with which |
| C．about which |
| D．into which |
Ladies and gentlemen, please fasten your seat belts. The plane__________.
| A．takes off | B．is taking off | C．has taken off | D．took off |
－Look! Billy is kicking________ dog.
－I hate to see anyone who kicks______ dogs.
| A．a ; / | B．the ; the | C．a ; the | D．/ ; / |
Believe it or not. My grandpa , 95 years old now, ________World WarⅡ.
| A．went across | B．passed through | C．went through | D．went by |
The flowers his friends gave him will die if _______ every day.
| A．not watering | B．not watered | C．not to water | D．not being watered |
－What do you think we can do for our aged parents?
－You_______ do anything except to be with them and be yourself.
| A．don’t have to | B．oughtn’t to | C．mustn’t | D．can’t |