Lian Zhan _____form Taiwan _______ paying his first visit to the mainland of China．

______ without friends ______ the most difficult challenge for Chuck while living on the island.

The boy’s parents, who let him play football indoors, rather than the boy ________ to blame for the broken window. 

 —________ two months enough for the project to be finished?—I am afraid not. The professor is ill and only after he recovers ______ go on with it.

 — A number of people _______ killed by the terrorists at the Urumqi train station.— _______ terrible it is!