1 Don't argue with her, you .... her age.

A may respect
B might respect
C ought of respect
D are to respect

2 This is serious; you .... at it.

A should not laugh
B oughtn't laugh to
C may not laugh
D don't laugh

3 We .... to write and thank them for their hospitality.

A may not forget
B don't forget
C shouldn't forget
D might not forget

4 He .... to see us tomorrow.

A may comes
B may come
C may to come
D mays come

5 They ... finish the work by Thursday.

A shouldn't
B not might
C don't may
D may not