Isn’t it hard to drive downtown to work—Yes，that’s why I________to work by train

Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it. [ ]

I’m sorry, I can’t go shopping with you. – Never mind. Lily will go with me.

________ people are concerned about now is the Shanghai World Expo, which ________ start on May 1st

How many students are there _________ homes are not far from our school in your class