We are glad_____that traditional Chinese medicine can work wonders in preventing some diseases．（ ）
A．knowB．to knowC．knowing
﹣﹣﹣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
﹣﹣﹣Have you seen the movie Zootopia？
﹣﹣﹣Yes，I've seen it twice．Of all the movies I've ever seen，It's the____one．（ ）
A．interestingB．more interesting
C．most interesting