Please open a window _________ turning on air conditioning.
-----We can use QQ to chat with each other on the Internet.------Really? Will you please show me ________it?
I won’t be able to understand what you say _______you speak too quickly.
________the English club at school is the best way to improve our English.
If you don’t know the words, you must ______in a dictionary.
We are all ______ about the ______ movie.