The following are all traffic signs except .
If it rain tomorrow，we’ll go on a trip.
A．isn’t B．doesn’t C．won’t D．is going to
Some volunteers(志愿者) from Beijing arrived in Shanghai
April 29 to work for the World Expo.
A．on B．at C．of D．to
--Did you see a girl in red pass by just now?
--No, sir. I _______________a newspaper.
A．have read B．was reading C．would read D．am reading
---- Do you know how to prevent (预防) the H7N9 flu?
---- You can ask the doctor for some ________.
A．snacks B．suggestions C．plans D．gestures
He was riding to school it began to rain.
A．as B．so C．while D．when
