_______ the website of Entertainment in Baidu, and you will learn that the Korean singer PSY has released a new song named Gentleman.

—Must I turn off the gas after cooking? —Of course, you can never be ____careful with that．

Please arrange ___ first, and then let him have a good rest.

Don’t give up regardless of difficulty and failure,         you’ll never achieve your goals.

To succeed in doing an experiment,________.