—What do you think of the plan to travel to the United States?—_________,it is not practical at all, for none of us are rich enough.
Nobody believed his reason for being absent from the classhe had to meet his uncle at the air port.
If you are travelingthe customs are really foreign to your own, please do as the Romans do.
Isn't it time you got down tothe papers?
I just wonder ____ that makes him so excited.
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.