It took me half _______ hour to finish my homework last night．（ ）
A．aB．anC．the
The energy from the sun and wind is very cheap and will never ________．（ ）
| A． |
run out |
B． |
cut out |
C． |
come out |
D． |
give out |
﹣I heard Ted got hurt badly in the car accident yesterday．
﹣It was true． His careless driving was the ________ of the accident．（ ）
| A． |
mistake |
B． |
excuse |
C． |
cause |
D． |
answer |
﹣You look tired today!
﹣You know we have too much homework to do every day． ________ of the students in our class don't have enough sleep．（ ）
| A． |
Two third |
B． |
Two thirds |
| C． |
Second three |
D． |
Two three |
Our hospital needs two ________． You can ask your daughter to have a try．（ ）
| A． |
women doctors |
B． |
woman doctors |
| C． |
woman doctor |
D． |
women doctor |
The final exam is very important． We must take it ________．（ ）
| A． |
careless |
B． |
carelessly |
C． |
serious |
D． |
seriously |