We may meet all kinds of difficulties in the future， but we should be confident enough to any challenge.
A. put on B. get on C. take on D. try on
You can’t imagine how beautiful the mountain is _____you see it with your own eyes.
A. until B. after C. while D. when
She has finished typing but she doesn’t know _______ next.
A. what to do B. how to do
C. what should she do D. how she should do
The kind teacher devoted all her time she had ___________ her students.
A. help B. to help
C. helping D. to helping
— It’s dangerous to walk across the street carelessly.
— You’re right. We can’t be careful while crossing the street.
A. so B. very C. too D. more
It’s quite clever ________ you _______ out the problem.
A. for； working B. for； to work
C. of； working D. of； to work
