Be careful not to ______ your bike with so many heavy bags.
| A．turn off | B．set off | C．take off | D．fall off |
They have been skating __________.
| A．for three hours | B．since three hours ago |
| C．three hours ago | D．since three hours |
That bag isn’t mine. It may be __________.
| A．somebody’s | B．somebody else |
| C．somebody’s else | D．somebody else’s |
In Great Britain it isn’t polite ______ from each other’s plate.
| A．eat | B．to eat |
| C．eating | D．for eating |
Have you ever ________ the Great wall?
| A．been to | B．gone to |
| C．go to | D．been |
While we _________, we saw a UFO land on a street.
| A．were shopping | B．shopped | C．are shopping | D．shop |