Beijing a lot in the past ten years. Now it has become one of the biggest modern in the world.

I have a word with you It won’t take long.

______ the maths problem is difficult， I’ll try very hard to work it out.

What a nice meal! It’s really kind of you to invite us.— __________. I’m glad you liked it.

How ______ I help youto understand ______ you wouldn’t listen to me