11.We spend time _______________ volunteer work. A. doing B. to do C. on doing D. for doing 12.My father prefers reading to ______________TV. A. watching B. watch C. watched D. watches 13.Lam is studying very hard because she ____________________an exam next Monday. A. is going to have B. won't have C. are having D. has 14._______________don’t children play in the chicken? Because it is dangerous. A. Why B. When C. Where D. Who 15.His daughter is not old ________________ to drive a car. A. enough B. many C. much D. too 16.We _______________ tennis a lot, but we don’t play very often now. A. used to play B. was playing C. are used to play D. play 17.According to the law, drivers ___________________ at stop signs. A. must stop B. has to stop C. should stop D. ought stop 18.Mr. Brown _____________________ this city two years ago. A. left B. leaves C. is leaving D. will leave 19.Unfortunately, the new wife was very _______________________ Little Pea. A. cruel to B. nice to C. friendly with D. cruel with 20.Tam Cam is always one of the famous _______________that many children read today. A. folktales B. stories C. books D. pictures