Smile to the world, the world will smile back to you.
A. but B. or C. and
Bad habits will get _____ the way of your life.
| A．on | B．by | C．at | D．in |
You must concentrate _____ your study not on your clothes.
| A．on | B．with | C．in | D．to |
There are so many beautiful clothes in the store. I really don’t know _____.
| A．what to choose | B．how to choose |
| C．when to choose | D．which to choose |
We all know the _____ of learning English well.
| A．important | B．importance |
| C．different | D．difficult |
The room must _____ up right now. It’s too dirty.
| A．be cleaned | B．be cleaning |
| C．clean | D．cleaned |