3×6=18

5×5=25

11×6=66

Children enjoy ______ to ghost stories on Halloween night.

A. telling and listening C. to tell and listen

B. tell and listen D. telling and listen

We walked for ten kilometers and then we stopped_______a rest.

A. to have B. have C. having D. has

You can pass the exam by_______harder.

A. studying B. study C. to study D. to be studying