raffic slowed down because of theheavy snow in Yushu county, presenting a new __________ to the recovery fromthe earthquake.

d my eyes upon the newcomer, wondering whether I________ him somewhere before．

下列各句中，没有语病的一句是（ ）

You did not perform as well as the other competitors— ,you failed.

Soon they got to the bank,____stood a big pine tree