50. Teachers should be _____ with their students but should not be _____ on them.

With the touch of a button or the click of a mouse, a student will find ______ information from the largest libraries and museums in the world.

The two leaders have _____ the foundations of a new era in cooperation between their countires.

Christine is about anything but her dress as she doesn’t really care about what she looks like in the eyes of others.

____ you ever _____to Yantai —Yes, three times.