My grandpa knows the history and medical _______ of many plants．（ ）
A．wealthB．priceC．valueD．cost
Look!Julia as well as her sisters ________ a kite on the playground.（ ）
| A． |
fly |
B． |
flies |
C． |
is flying |
D． |
are flying |
- 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 |