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