The two dresses are very nice. I can’t decide _________。
| A．which one should I buy | B．which one to buy |
| C．which one I to buy | D．which I bought one |
Sixteen-year-olds should _________their ears pierced.
| A．be allowed to get | B．be allow to get |
| C．allow to get | D．be allowed getting |
His grandparents used to ________ a walk after dinner, but now they are used to ________ a walk after breakfast.
| A．take, take | B．taking, taking | C．taking, take | D．take, taking |
My sister was ________out at night.
| A．terrified of go | B．worry about going |
| C．come up with going | D．afraid to go |
______ is necessary _______ us ________learn English well.
| A．It, of, to | B．This, of, of | C．It, for, to | D．This, for, to |