Mary is waiting for me ，一一一一一一1have to hurry up.

With many major economic problems_______ to be addressed, there is no point _______ the growth rate of this year now.

Would you like to walk along Yueya Lake with me tomorrow afternoon—Certainly, ______ I am too busy.

I think science is more useful thanart.—- I disagree. I think art is _________science.

Her son began to play __________piano when he was only three. Now he’s very good at it .