1 . doing,   he,   busy,   the experiment,   is        
________________________?

2 . 学生们在忙着准备考试。
The students are busy_______   _______the exam（考试）.

3 . —The two old friends were ________ busy ________ with each other that they forgot the time.
—Yes. They hadn’t met for over ten years, so they kept talking the whole night.

A．too; to talk

B．too; talking

C．so; to talk

D．so; talking;

4 . Tina is busy ________ at school, but she never forget ________ her mother every day.

A．work； to call

B．working； to call

C．working； calling

D．work； calling

5 . Tom with his family ________ busy ________ the Spring Festival.

A．are; prepare with

B．are; prepares for

C．is; preparing for

D．is; preparing of

6 . Look! The students are busy________ for the test.

A．study

B．to study

C．studying

D．studies

7 . They are busy ________ their homework.

A．do

B．doing

C．does

D．to do

8 . Look! These farmers are busy ______   rice in the field.

A．to cut

B．cutting

C．cut

D．with cut

9 . 秋天，农民们忙着收割庄稼。
Farmers________in autumn.

10 . Mary is busy ________ the housework now.

A．with

B．do

C．doing

D．both A and C