This question is ______ easy, all the students can answer the question.
He ____ have finished his work; Otherwise, he would.not be enjoying himself by the seaside.
With more forests being destroyed, huge quantities of good earth_______ each year.
_______in the forests for nearly a week, the two students were finally saved by the local police.
The place______ the bridge is supported to be built should be _____ the cross river traffic is the heaviest
_____ walk is expected to last all day, so bring_____ packed lunch.