Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
| A．explains ; to | B．has explained ; for | C．has explained ; to | D．explained ; with |
There ______ a pen and a map on the desk.
| A．is | B．are | C．has | D．have |
This ________ my grandfather and those are my ________.
| A．is; friends | B．is; friend | C．are; friends | D．am; friend |
E-mail Tom Mary@163.com , please.
| A．in | B．at | C．on | D．/ |
_____a cat. We do not know_____ name.
| A．It is, its | B．Its, it is | C．It is, It is | D．It is, is |
I can see a pen ______some pencils on the desk.
| A．are | B．and | C．but | D．to |