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 |
_______, what’s your hobby?
| A．In the way | B．On the way |
| C．To your way | D．By the way |
They have been skating __________.
| A．for three hours | B．since three hours ago |
| C．three hours ago | D．since three hours |