______is unhealthy for us to go to school without eating breakfast in the morning. ( )
A.ThatB.ThisC.It
------Must I finish my homework now ?------No, you _________ . You can do it tomorrow .
We be too careful while dealing with these social problems.
——He can write well.——He_____, but he doesn’t. He’s too lazy.
Rick has learned a lot about Chinese culture _____ he came to China.
--Sorry, I overslept. I forgot to set the alarm.--Your clock ________. Perhaps you should buy a new one.