.There are over 58000 rocky objects in _______space,about 900 of which could fall down onto ______earth。
The ground is________with ________leaves.
The interesting book is said ________ into a lot of languages in the last five years.
You'd better __________ your reasons right now. We have no time to waste.
They have a good knowledge of history but little __________ they know about geography.
It wasn't until nearly a month later __________ I received the manager's reply.