Professor White has received a letter ___ to give a lecture in Peking University.

We all feel it is you as well as your wife that ________ for your son’s bad performance at school.

Has the boy who was made use of ________ realized his mistakes?

The new student was very slow to __________ the unusual rules of the school.

 ___that she’s by law old enough to get married, I don’t see how you can stop her.