TheChinese government has made great effortsto______thegapbetween the rich and the poor, but hasnot achieved obvious results.

.He was deep in thought withhis eyes______ on the ceiling.

We are all aware _________ the many threats _________ the environment and we need to take action to prevent us from the bad consequences

Cancer is ________ second only to heart disease as ________ cause of death.

Who found child at last— The police. They found him in a corner of small room.