Chia từ ở dạng đúng: John is interested in ... voluntary work (do)

Mọi người giúp em với ạ 
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28. John is interested in
voluntary work. (do)
is suitable for teenagers because it is cheap. ( produce)
29. This
30. The World Health
V/ Rearrange these following words into complete sentences: (0,5pt)
31. taught/ Mr. Robinson / has/in this school/1987/since.
is an intemational one. (organize)
32. help me/ Could' carry/ you' my luggage ?