My computer has caught a virus and it has gone wrong．
______________________（ ）
A．I'm sorry to hear that．
B．Don't mention it．
C．It doesn't matter．
D．I'm sure it can work．
﹣﹣These days，teenagers often have to do what they____to．
﹣﹣It's not good for their independence．They need to think on their own．（ ）
A．tellB．are telling
C．are told
﹣﹣﹣It's the second time I came to Xiamen．It____a lot．
﹣﹣﹣Yes，it's more and more beautiful．（ ）
A．was changingB．has changed
C．will change
﹣﹣﹣Tom，let's hang out after school．
﹣﹣﹣Sorry．I have_____Frank to work on the biology report with him．（ ）
A．advisedB．expectedC．promised
﹣﹣﹣These shoes look cool．_____are they？
﹣﹣﹣They are on sale，only 69dollars．（ ）
A．How muchB．How longC．How many
﹣﹣﹣I think everyone should play a part in saving our environment．
﹣﹣﹣I agree．For example，there will be less air pollution_____we drive less．（ ）
A．ifB．soC．though