The two companies decided to work together ______ they had common interest．（ ）
| A． |
because |
B． |
unless |
C． |
but |
D． |
or |
- I am worrying about our final exam these days.
- There is nothing to worry about ________ you work hard.（ ）
| A． |
until |
B． |
so that |
C． |
as far as |
D． |
as long as |
In the past，people didn't know that the earth ________ around the sun.（ ）
| A． |
will move |
B． |
moved |
C． |
would move |
D． |
moves |
I'd like to express my thanks to everyone ________ served the community.（ ）
| A． |
which |
B． |
who |
C． |
where |
D． |
when |
Stop playing computer games.It ________ too much of your time.（ ）
| A． |
takes |
B． |
takes off |
C． |
takes back |
D． |
takes down |
It ________ 100 years since the Communist Party ________ .（ ）
| A． |
was；was founded |
B． |
has been；was founded |
| C． |
has been；founded |
D． |
was；founded |