Choose the correct answer A, B, C, or D.

1. It is important for Grade 12 students to keep ______ with the changes in the university entrance exams.

A. up               B. on               C. down               D. to

2. My father left his job because he couldn't put ______ with his colleagues' constant complaining.

A. on               B. up               C. along               D. through

3. The company is planning to cut down ______ staff to reduce costs.

A. in               B. along           C. on                   D. at

4. Many teenagers find it difficult to live ______ to their parents' expectations.

A. in               B. on               C. back               D. up