đổi sang thể bị động :
1) it was blowing the leaves all over the pavement.
2)Does the hotel provide clean towels?
3)Has someone posted the letter ?
4)They used to start these engines by hand.
5)Why did not they mend the roof before it fell in.
chọn từ thích hợp :
your sister used to visit you quite often,(didn't she,doesn't she, usedn't she,wouldn't she ?)
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Sinh Học lớp 12
