He did his best to stay awake, but the performance was so boring he just dropped _____ to sleep.

单选题

He did his best to stay awake, but the performance was so boring he just dropped _____ to sleep.

答案解析

单选题

_____, he always tries his best to complete it on time.

答案解析

单选题

Once man began to raise his own animals,he did not have to go out and hunt for his meat.And,since he did not have to move from one place to another hunting for food,man was able to（ ）down and live in one place.

答案解析

问答题

He removed his sweater to ﹍ his muscular arms.

答案解析

单选题

When he was in his he began to study English.

答案解析