Mother told Jim to watch the milk until it boiled and then _____ off the gas.
| A．turn | B．turning | C．turned | D．having turned |
A cook will be immediately fired if he is found _________ in the kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |
_____by one of his fellow soldiers，the wounded man walked slowly across the field．
| A．Supporting | B．Supported | C．Support | D．Been supported． |
Jenny worked hard before the final examination，and it_______．She got an A．
A．showed off B．paid offC．put off D．took off
All the things __________ must be done well．
| A．worth to do | B．worthy of being done |
| C．worthy doing | D．worth of doing |
Follow your do
ctor’s advice,_____ your cough will get worse.
| A．or | B．and | C．then | D．so |