Most students exercise __________ a week.
| A．once or twice | B．one time or two time |
| C．once time or twice | D．once or two time |
Drinking more water is a good way to ______ the flu.
A. prevent B. cause C. break
There are about five ______ animals in the zoo.
A. hundred B. hundreds C. hundreds of
—Jane looks ______ today. What’s wrong with her?
—She has a fever.
A. active B. angry C. tired
One of my classmates ______ going to take part in the long jump tomorrow.
A. will B. is C. are
Lucy does well ______ math. You can ask her for help.
A. in B. at C. with