We spent the entire day looking for a new hotel.
Giải chi tiết:
Đáp án là C. the entire day = all day long: cả ngày, suốt ngày dài
Population growth rates vary among regions and even among countries within the same region.
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.