Do you know _______ young man under the tree?—-Yes, but only a little, maybe he is _______ university student.

Different countries have different customs.—Yes. What we say in China may rude in America.

The children have six ______ classes every weekday.

I believe that he _____ us as soon as he comes back to China.

He jumped to his feet, thinking that the planes were going to ________.