Which is ________, the sun, the moon or the earth—Of course the moon is.

Mr. Smith won’t go to work if he this afternoon.

It was only after he had read the papers ________ Mr. Gross realized the task before him was extremely difficult to complete.

The road was so narrow that there would betraffic jams____, especially during the rush hour.

_____ Dasan is from Canada, he can speak Chinese very well.— I know he studies Chinese hard.