Insert a, an or the if necessary: I remarked that if there was . . . leak in . . . gaspipe there might be . . . explosion while he was reading . . . meter.

I remarked that if there was a leak in a/the gaspipe there might be an explosion while he was reading the meter.

Dịch: Tôi nhận xét rằng nếu có rò rỉ trong ống dẫn khí, có thể có một vụ nổ trong khi anh ta đang đọc đồng hồ.