For theme parks, ______ is the key to _____ visitors, which contributes to the success of running them. [ ]

Who helped you clean the classroom yesterday—____________. I did it all by myself.

______ you a happy New Year, boys and girls! I ______ you can have fun.

(2013·天津，6)We have launched another man­made satellite，________is announced in today’s newspaper.

nyone phone during the board meeting,please tell them I am busy.