__________ of his parents are doctors.

Three years ago，a society was set up to________the endangered animal and plant life from dying out in this area

He loves mountain _______ and kept on _________ mountains even after losing his arm.

You should always exercise, ______ it’s only ten minutes every day.

Would you mind if I borrowed your car just over the weekend?—I’m sorry, but it’s just not possible, because I ________ my mother this weekend