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___ bike. 22. read _____oneself (alone) 自己讀書 23. at ____ ___ ___ four = when she was 4 24. decide _____(try) out (試用;選拔 ) 25. learn ___(do)… teach sb. ___(do)… 26. go on a (different) ____ 進(jìn)行一次不一樣旅行 27. _____(volunteer) here ___(be)good for him. 28. at the ____time 同時(shí) 29. be busy ___(介詞 )sth. be busy ___(do).. 忙著做 … 30. be _____about sb./ sth./ _____(do)… 擔(dān)心 … 31. They did what they can _____(help) others. 32. _____(volunteer) our time _____(help) these people _____(be) a good way______(spend) our free time. (1)動(dòng)名詞做主語,表單數(shù)。 ( 2) volunteer to d