When we plan our vacation , mother often offers______suggestions.

Sometimes they may play to passers-by in the street or subway so that they can earn some______ money for themselves or to pay for their instruments.

During the construction of the Qinghai-Tibet Railway, 33 migration overpasses have been made_______for herds of Tibetan antelopes to go through their breeding grounds.

Once out of the earth’s gravity, the astronaut is________ by the problem of weightlessness.

We waited for the books he bought for us in             day and night.