Every student is required to watch the teacher carefully before ___ the chemistry experiment.
A. performing B. taking C. picking D. having
I am a stranger here. So the city isn’t familiar ______ me.
A. with B. by C. in D. to
—We want to sit at the table near the window.
—I’m sorry，but it________ already.
A．has taken B．took C．was taken D．has been taken
I would __________it if you would let me deal with this by myself.
A. appreciate B. inspect C. protect D .replace
The farmers suffered a heavy ________because of the terrible storm.
A. zone B. harm C. loss D. insect
Some people waste food，________other people haven’t got enough to eat.
A．when B．until C．since D．while
