( )你向别人询问一个问题前,你应该说:A. Excuse me. B. Thank you.
_____ she need a computer. A. Do B. Does C. Is
I am sending these postcards ____ Canada. A. in B. on C. to
Where _____ the traffic lights? A is B. are C. have
We buy stamps ______ . A. at the post office B. in a bicycle shop C. in a restaurant
She ____ a stamp for his letter A. need B. needs C. to need.