The new policy allows a couple to have a second birth _____either is an only child.
| A．though | B．if | C．unless | D．until |
The stone on the river bank rolled under her feet; she was _____into the river，and she called out for help.
| A．being jumped | B．jumped | C．pulled | D．being pulled |
-Everyone says you are a good student. You are never late for school，are you?
-_______.
| A．No，sometimes | B．Yes，sometimes | C．Yes，I did | D．No，I do |
_____ all the inventions have in common is ______ they have succeeded.
| A．What; what | B．That; what | C．What; that | D．That; that |
Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
| A．that | B．as | C．so that | D．which |
A cook will be immediately fired if he is found ______in the kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |