----What about going on a trip?----Sound a good idea. But I don't have time now and____it's too expensive.
The geography teacher told his student that the earth ________around the sun .
_________useful advice it is ?
John rushed out in a hurry,the door .
----Why are you late for school ?----Because our car _______ halfway to the destination.
With a lot of difficulties ___ , they went to the seashore and had a good rest.