All __________ people on the earth should use the natural resources wisely, or they __________ by the nature sooner or later.

We had just covered a distance of three miles the engine and the car came to a stop

wonder so many students and their families are visiting Boston —area schools, such as Harvard, in their summer holidays.

─Wow！Your hairstyle looks so fashionable！─ . It’s my mother’s design！

rdly know each other, _________