There are ________ students in our class.

A. twentyone

B. twenties

C. thirty-one

D. thirtyones

There are ______ students in our class than in theirs.

[    ]

There      50 students in our class.

There      50 students in our class.

1. A.
   be
2. B.
   is
3. C.
   am
4. D.
   are