“One one zero” 表示 ____。A. 火警 B. 匪警 C. 急救中心
Teenagers should_____________ drive. They’re not serious enough.
_____ they _____ to go to the park when they were children?
--do you improve your English ? --I improve itpracticing it more often.
We had fun __________ in the lake last Sunday. A. boat B. boating C. boated
Stop _______ on the ice. It’s too dangerous. A. skatedB. skating C. to skate