At that time, he spent as much time as he can_______the ancient status which would be sank in the river.

__________ if they have the party today?—Half the class won’t come.

I think _________ of the materials I listened to at the beginning of the exam __________ easy.

It’ll stop the sand from moving_____the rich farm land in the south.[ ]

I had a bad cold. The doctor asked me ______ in bed for a good rest.