_______ the help of my teacher, I worked out the problem in the end.
| A．Under | B．On | C．with | D．For |
The price of this bicycle is quite _________. I don’t have enough money to buy it.
| A．low | B．rich | C．high | D．expensive |
My father _________ Beijing on business for three days. He will be back in two days.
| A．have gone to | B．has gone to |
| C．has been to | D．has been in |
Our teacher told us light _________ much faster than sound .
| A．travels | B．traveled | C．had traveled | D．will travel |
—________ have you been in this school?
—For two years.
| A．How often | B．When | C．How soon | D．How long |
Would you mind _________ in class?
| A．no talking | B．not talking | C．no talk | D．not talk |