1 . supposed, others, to, you, are, greet
_______________________________________________.

2 . You should shake hands when you meet someone for the first time.(改为同义句)
You ________ ________ ________ shake hands when you meet someone for the first time.

3 . 在许多国家，朋友们第一次见面时都应该握手。
In many countries, friends are ________ ________ shake hands when they meet for the first time.

4 . We are ________ (suppose) to protect the environment.

5 . not, a, you, wear, supposed, are, suit, to
__________________________.

6 . help,     the,     we're,     sharks,     supposed,     save,     to
____________________________.

7 . As Grade 9 students, we're ________ to work harder than before and not to spend too much time playing.

8 . We are s________ to hand in homework on time.

9 . In the school hallways, the students are ________ (suppose) to speak and act quietly.

10 . Animals are our close friends. We are supposed ________ them.

A．to protect

B．protecting

C．protect

D．to protecting