You won't work out the problem ______ you understand it. So listen to me explain now.
| A．since | B．when |
| C．unless | D．though |
---What’s on the desk?
— There are two .
A. pencil B. dictionaryC. rulers
If(如果) this is your backpack, please call Ann 32467589.
A. in B. atC. of
---Who is that boy?
---- He is my .
A. father B. brother C. grandfather
---Is he Johh?
---He’s Dave
A. Yes, he is B. No, it isn’t C. No, he isn’t
--- What’ s his?
---- It’s 245---8027.
A. name B. answer C. Phone number