—It’s dangerous to swim here. Look at the sign!
—Oh, I _______ it.
| A．didn’t notice | B．don’t notice |
| C．hadn’t notice | D．haven’t notice |
—May I use your computer, Mr. WU? —______．
| A．Yes, you may not | B．No, you may |
| C．Yes I may | D．No, you may not |
This dress still looks pretty on you, _______ it is out of style．
| A．but | B．though | C．since | D．Unless |
— Is Lily good at singing? —Yes , she is．We often hear her_______ in the next room．
| A．sing | B．to sing | C．sang | D．Sings |
— Will you go to Sandy’s birthday party? — I won’t go unless Tony______．
| A．was invited | B．has invited |
| C．is invited | D．will be invited |
—_____will you stay here? —Until tomorrow afternoon．
| A．How long | B．How soon |
| C．When | D．How often |