You should be _______ careful when you take the chemistry exam.—I agree. In this way, I will make _______ mistakes.

It’s time for us as parents to teach our children right way to dress.

Let’s look at pictures ______ Beijing Opera. [ ]

It’s important ______ you to learn English well.[ ]

Look! That man looks like Mr Green.—It can’t be him. He _________ to America.