There are eight _______ students in our school. They must be _______ every day.
| A．hundreds, on time | B．hundreds of , in time |
| C．hundred, on time | D．hundreds of , on time |
She is always listening to music ____doing her homework.
| A．as | B．while | C．until | D．though |
Someone called me up in the middle of the night, but they hung up I could answer the phone.
| A．as | B．since | C．until | D．before |
I will go to visit my aunt in England ______ the summer holiday starts.
| A．while | B．since |
| C．until | D．as soon as |
The little boy is only six years old, _________ he can make wonderful model cars.
| A．so | B．or | C．but | D．/ |
Please knock at the door ________ you come into the room.
| A．before | B．after | C．until | D．while |