I often saw the boys in the river.
| A．swam | B．swimming | C．to swim | D．swim |
----Sixteen-year-olds should not be allowed to drive a car.
----I agree. They are ____________.
| A．too serious | B．not serious enough |
| C．too calm | D．not enough serious |
Everyone needs at least eight _________ sleep a night.
——I agree.
| A．hour | B．hours | C．hour’s | D．hours’ |
You will achieve nothing _you work hard.
| A．if | B．unless | C．when | D．That |
The Voice of China is very popular , lots of people love to _________ to watch it.
| A．wake up | B．get up | C．stay up | D．make up |
—Can I get my ears pierced, Mom? —No. As a student, you ________ do that.
| A．are allowed to | B．should be allowed to |
| C．may not | D．shouldn’t be allowed to |