ingC．gettingD．sounding
11．A．natureB．schoolC．lifeD．family
12．A．taughtB．helpedC．visitedD．joined
13．A．methodsB．contentsC．problemsD．subjects
14．A．listB．goalC．planD．note
15．A．usedB．keptC．understoodD．knew
16．A．weeklyB．regularC．monthlyD．informal
17．A．foolishB．difficultC．necessaryD．unusual
18．A．grownB．familiarC．boredD．careful
19．A．insteadB．thereforeC．howeverD．besides
20．A．evenB．seldomC．stillD．just
BADCB CDABD CADAB CBACD