periment has_________ the possibilityof the existence of any life on that planet, but it does not mean there is nolife on other planets.

It’s an important decision for you, so______ your time and think it over.

The old man asked Lucy to move to another chair__________he wanted to sit next to his wife

His great contributions the development of a modern China will never be forgotten.[ ]

We must keep our room clean，for dirt and disease go________，you know.