It’s not good for us ________ late for class．We should be on time．
| A．be |
| B．to be |
| C．arrive |
| D．arrive to |
—Could I invite my friends to my birthday party?—Sorry, you ______.
| A．can | B．can’t | C．could | D．couldn’t |
Our math teacher is very kind ______ he looks very serious.
| A．because | B．though | C．if | D．when |
This isn’t my sister’s skirt. ______ is blue.
| A．Mine | B．His | C．Yours | D．Hers |
Now the air in our city is ______ than it used to be. Something must be done to stop it.
| A．good | B．bad | C．worse | D．better |
This type of MP5 is so expensive that I can’t ______ it.
| A．afford | B．spend | C．cost | D．pay |