He volunteered to work in a remote mountainous village in West China last year, which is still _____ on foot now.

We can see the blue sky and the shining sun There is no possibility _____ it will rain or snow today

When will you come back —_______ July 5th.

This problem may lead to more serious ones if ____ unsolved.

en the Chinese delegation arrived atVienna airport, they were received _____ cheers.