Liu Xiang and Yao Ming are famousplayers.____of them have set a good example to us.

May I speak to the patient now?—No, you _____. He is too weak now.

It is very important for us_____ English well.

10,000 dollars is a large sum of money，but it is still ______than we need for a new house

Have you ever met with this case in your life 　　　　 you can’t understand others even if they have said something several times？