---_________ the door, please.
---Please come in. The door________.
| A．Be open; opens | B．Be open; is opening |
| C．Open; is opening | D．Open; is open |
--When did you become a volunteer for the elderly?
-- Two years ago. I this group since then.
| A．joined | B．took part in | C．have joined | D．have been in |
He met many problemshe was going over his lessons.
| A．before | B．as soon as | C．since | D．while |
--Where does your uncle work, Tom ?
--He is in a hospital he works as a doctor.
| A．that | B．which | C．where | D．what |
In our school library there a number of books on science and the number of them
g rowing larger and larger.
| A．is , are | B．are , is | C．has , is | D．have , are |
A lot of traffic was kept from going into the city centrethe heavy snow?
| A．because of | B．thanks to | C．thanks for | D．with the help of |