11. If we ________less paper, we ________the number of trees in the forests. A. used/ will save B. use/ can save C. can use/ save D. use/ can 12. She won’t take all the suitcases ________she likes to travel light. A. so B. but C. because D. therefore 13. She is very tired; ________, she has to finish her homework. A. moreover B. so C. and D. however 14. - Is he an actor ________a singer? - An actor A. and B. or C. with D. so 15. He was tired, ________he took a rest before continuing the work. A. so B. and C. but D. if 16. Who looks ________your children when you are away from home? A. for B. at C. after D. to 17. Why doesn’t she go ________with her university study? A. in B. at C. to D. on 18. After coming home, she cleaned the floor ________cooked dinner. A. but B. however C. moreober D. and 19. They didn’t understand the matter ________she didn’t ask for help. A. but B. however C. moreover D. and 20. How about ________posters on energy saving and hanging them around our school? A. make B. making C. to make D. to making