----- Nội dung dịch tự động từ ảnh -----
1. When I arrived at the food bank, __________
A. she was waiting for me.
B. she has waited for me.

2. I saw this advertisement __________
A. while I read the school noticeboard.
B. while I was reading the school noticeboard.

3. While I was helping at the food bank, __________
A. I met an old friend.
B. I meet an old friend.

4. I was preparing a meal __________
A. when I heard the announcement.
B. when I hear the announcement.

5. We realized how generous people were __________
A. while we sort out the donations.
B. while we were sorting out the donations.

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Unit 4 | For a better community