She says that she'll have to close the restaurant____business improves．（ ）
| A． |
if |
B． |
after |
C． |
unless |
D． |
when |
It is important ___us to make full use of time．（ ）
A．forB．ofC．with
The woman ___is talking with my mother is our class teacher．（ ）
A．whichB．whoC．whose
The school sports meeting will be ___because of the heavy rain．（ ）
A．put upB．put onC．put off
David never fights with his classmate，____？（ ）
A．does heB．doesn't heC．isn't he
The new railway ___in our hometown in 2013．（ ）
A．was builtB．is builtC．has built