Eric is so careful that he always looks over his exercises to ________ there are no mistakes.
| A．make sure | B．find out | C．think of | D．look for |
We can go to a _______ to mail things.
| A．post office | B．restaurant |
| C．tea house | D．gas station |
Let’s play computer games _______ a while.
| A．under | B．on | C．in | D．for |
—Where is your CD?
—It’s _____ the Walkman.
| A．in | B．at | C．on | D．next to |
Kangkang usually goes to school by _______.
| A．a car | B．the car | C．cars | D．car |
It’s time _____ school.
| A．to | B．at | C．for | D．in |