Once we discover a mistake, we should not ______ it but correct it immediately, to create better conditions for economic development.

Would you mind if I turned down the tape recorder a little?—______.

I’m 1.70 metres. Yao Ming is 2.27 metres. I am Yao Ming.

What good news! We will have long holiday after the exam.

I’m a little weak in Maths. I don’t know how to improve it. — Why not __________ Daniel for help? He’s very good at it.