1. —These books are too heavy for me to carry.

—________.

A. Never mind          B. I’ll give you a hand                      C. Let me do you a favor  D. No problem

2. My uncle promised to buy a nice gift for my birthday, ________ beyond my imagination.

A. which               B. that                C. something           D. the one

3. ________ Maya civilization collapsed remains a mystery. The once-great cities fell into ruins.

A. What                B. Why                 C. Whether             D. That

4. ________ he passed away in 1961, Mei Lanfang had been performing and encouraging the spread of Peking Opera for almost 60 years.

A. Once                B. As                  C. Until               D. Since