21. I crossed the street to avoid _____ him，but he saw me and came _____ towards me．
A. to meet; to run B. to meet; running
C. meeting; to run D. meeting; running
22. I preferred ______ at home rather than ______ shopping．
A. to stay; go B. to stay; going C. staying; go D. staying; going
23. What is Bob short ______?
A. at B. in C. for D. from
