The Communist Party of China will have its 100th birthday ______ July 1，2021.
A．inB．onC．forD．at
- Is that man your friend Tom？
- That man ________ be him，because he has gone to Canada.（ ）
| A． |
can't |
B． |
mustn't |
| C． |
needn't |
D． |
had better not |
- English is difficult ________ at the beginning.
- Yes，but if you keep ________ ，you can make progress.（ ）
| A． |
to be learned；trying |
B． |
to learn；trying |
| C． |
to be learned；to try |
D． |
to learn；to try |
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 |