1/My friends ( collect /collected /collect / has collected ) stamps every Sunday 2/At present ,people ( clean / are cleaning / is cleaning / cleans ) the ground

2 câu trả lời

=>

1. collect ( every -> dấu hiệu thì HTĐ)

2. are cleaning ( at present -> dấu hiệu thì HTTD)

1, collect (HTĐ)

2, are cleaning (HTTD)

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