IV. Write the correct form of the verbs in brackets to complete the following sentences.
1. It is very important (keep) our environment clean.
2. At 10 o’clock next Sunday, my dad ( install) new glass in the windows to stop heat escaping.
3. Mr Binh ( teach) us since the last semester?
4. Nam used to ( do ) jigsaw puzzles in his spare time
em cmon ạ
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