﹣Tim, you spent too much time on computers. It's harmful to your eyes.
﹣ see. Thank you. I will do more sports instead.( )
A.is good forB.is bad for
C.is helpful to
It’s 12:00 pm now. They _________ be sleeping.
—Another cup of coffee? —No, thanks. I ________ be off. My friend is waiting for me at the school gate.
Must I finish my homework first? No, you ________.
The girl is so excellent that you ________ praise her too much.
—Listen! Someone is knocking at the door. Who _____it be? —It_____ be Tom. He phoned to visit me this evening.