. The experiment has_________ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.
| A．found out | B．pointed out | C．ruled out | D．carried out |
The boy was seen ___ his bikecycle while riding in the street.
| A．to fall off | B．fall off | C．to jump off | D．jump off |
The soldier stood there ___ , except that his lips moved a little as if he was saying to himself.
| A．still | B．till | C．until | D．untill |
---I went to the History Museum last summer. ----Did you go ___?
| A．else anywhere | B．to anywhere else | C．to else anywhere | D．anywhere else |
He is ill, and he has ___ in bed for a week.
| A．lay | B．lied | C．laid | D．lain |
We’ve made up our mind to finish this experiment no matter ___ difficult it was.
| A．what | B．when | C．how | D．how much |