Every time he opens his mouth, he immediately regrets what he said. He is always putting his foot in his mouth.
Giải chi tiết:
Đáp án là D. To put one’s foot in one’s mouth = to say something that you regret; to say something stupid : nói những điều ngớ ngẩn đáng xấu hổ = say embarassing things
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.