Bob’s dream is to be a professional basketball player, and he never it .

I’m going to travel to Hainan Island! — .

Ann spends two hours _______ sports in the gym every day.

Thank God you’re safe!—I stepped back，just________to avoid the racing car(2012·江苏，29)

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