--- Mum, I’m going to visit my aunt. What about a week? --- A week is too long. Try to be back in a ______ of days.
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.