Everyone makes mistakes in life．The key is not to repeat ________ again．（ ）
A．itB．thisC．thatD．them
﹣Why don't you buy the sweater？
﹣﹣It's too ____，and I don't have enough money to buy it．（ ）
A．niceB．expensiveC．popularD．cheap
Thanks for inviting ______ to your food festival．We really enjoyed ourselves．（ ）
A．weB．theyC．themD．us
Lang Lang is ______ famous pianist．He plays ______ piano very well．（ ）
A．a，theB．the，theC．the，/D．a，/
Would you mind my opening the window？
______，I've got a cold．（ ）
A．Never mindB．You'd better not
C．All rightD．With pleasure
Can I get you a cake?
______，but I have already got one．（ ）
A．No you can't
B．Here you are
C．You're welcome
D．That's very nice of you