1．The two students are both in the classroom，aren't they?

10.gave，with，best，wishes.

9．came，maybe，was.

8．subject，choose.

7．don't，have.

6．call，John，Jack，for，short.

5．Both，of，them.

4．Gave，a，talk，about.

3．is，one，of，most，difficult，subjects.

2．have，a，good，time，at.