You must concentrate _____ your study not on your clothes.
| A．on | B．with | C．in | D．to |
_____________ you go, I’ll be right here waiting for you.
| A．Wherever | B．Since |
| C．Although | D．As soon as |
A country has dreams. We teenagers __________ also have dreams. With dreams and hard work, anything amazing can be created.
| A．may | B．must | C．should | D．can |
My grandmother is over 90, but she is still in good health and stay ___________.
| A．safe | B．warm | C．awake | D．active |
一Oh，there’s someone knocking at the door．
一must be that naughty boy.
| A．H e | B．This | C．It | D．That |
Weuse mobile phones when the plane takes off．
| A．may not | B．should n’t |
| C．need n’t | D．must n’t |