Lucy， where's your sister？
Look! She ___________ in the yard with our dog．（ ）
| A． |
played |
B． |
has played |
C． |
plays |
D． |
is playing |
I’ll go to visit my uncle in England ________ the winter holidays start.
| A．while | B．since |
| C．until | D．as soon as |
The mobile phone has changed people’s life a lot ________ it was invented.
| A．until | B．since |
| C．before | D．after |
Getting enough sleep is good for _______ health _______ study.
| A．neither; nor | B．both; and |
| C．either; nor | D．neither; or |
— Hey, boy. You can’t cross the street now. You have to wait _______ the traffic lights turn green.
— Oh, sorry and thank you.
| A．when | B．until |
| C．while | D．after |
Mom was cooking ________ Dad was reading newspapers.
| A．as | B．when |
| C．while | D．since |