---How long have you been studying at this school?
--- I have been studying here____.
| A．since I was thirteen years old | B．when I was thirteen |
| C．at the age of thirteen | D．after I was thirteen |
Our teacher told us light ____ faster than sound.
A. traveled
B. travel
C. travels
-____ wonderful news, isn't it?
-Yes, it is.
A. What a B. WhatC. How
-Look! A man is standing on his two hands.
-Yes. It seems he_____ for long.
A. practiced
B. has practiced
C. was practicing
-When did you come back to Enshi?
-____the aftemoon of May lst.
A．On B．At C．In
-How many ____has the child had?
-Only four in the front.
A．ears B．tooth C．teeth