1 . Obey the traffic rules, ________   you’ll be punished.

A．but

B．while

C．till

D．or

2 . —What do you think of the accident happening last month?
—I knew nothing about it ________ I watched TV yesterday.

A．until

B．when

C．while

D．after

3 . Lucy Smith was watching a game when a car hit against a big tree.（改为同义句）
__________________ Lucy Smith was watching a game, a car hit against a big tree.

4 . cooking, she,   Jenny, was,   herself,   cut,   while
________________________________________________________________.

5 . —Mum, can we go to Uncle Wang’s farm this summer?
—Certainly. And ________ we are there, we can also learn how to grow vegetables.

A．since

B．unless

C．while

D．because

6 . My cousin has learned more about teamwork ________ he joined the school soccer team.

A．until

B．since

C．unless

D．while

7 . ________ days went by, Jack grew into a tall young man.

A．As

B．When

C．While

D．Since

8 . — Labour education is an important course for students’ self-development.
— Exactly. ________ schools put it into practice, students will learn a lot.

A．While

B．Since

C．If

D．As

9 . Jack has made great progress ________ he joined the English club.

A．when

B．since

C．while

D．before

10 . Father was watching TV in the living room ________ mother was cooking in the kitchen.

A．while

B．after

C．until

D．as soon as