Your hand is dirty. It needs ____________.

If a thing is worth ______, it must be well ______.

The man couldn’t _____the fact that the lost watch was found in his house.

Every possible means    to work out the problem, but it is too difficult for us.

I am sorry. I can’t    your opinion about this question.

I discovered that Lin Qiaozhi had ______ her whole life to her patients.

Earlier that day, when they crossed the Rocky Mountains, they ____ to catch sight of some mountain goats and even a grizzly bear and an eagle.
A. tried   B. had   C, managed   D. surrounded

We watched, amazed as fire _____ on the outside of the spaceship as the earth’s gravity increased.

He tried his best, but he couldn’t ________ the college entrance exams last year.

It’s very important for a student to ___ a good state of mind while taking the college entrance examination.
A keep out    B keep on   C keep up      D keep off