26.A.light 27.A.till 28.A.trouble 29.A.used 30.A.TV 31.A.heavier 32.A.hold 33.A.blackboard 34.A.find out 35.A.helpful |
B. heavy B. after B. prevent B. kept B. radio B. lighter B. build B. desk B. hand in B. famous |
C. useful C. before C. help C. invented C. pen C. cheaper C. discover C. screen C. get back C. good |
D. comfortable D. when D. understand D. lent D. com puter D. brighter D. practice D. card D. give back D. bad |