(给所给词的适当形式填空)1.my hobby is________(collect) stamps.2.Summer is the ________ (hot) season of the year.4.we should keep water ________clean.

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(给所给词的适当形式填空)1.my hobby is________(collect) stamps.
2.Summer is the ________ (hot) season of the year.
4.we should keep water ________clean.

collecting