(1) Students can’t leave the class early without the teacherˈs ________(许可).
(2)Vancouver is Canada’ s most beautiful city, s_________ by mountains and the Pacific Ocean.
(3)_________(凝视,盯着看) at people is considered rude in Britain and young children will be scolded by their parents if they look too long at another person.
(4)Eating carrots b________ your eyesight.
(5) I cannot solve the problem on my own, so I must ________ (咨询) my teacher.
(6)You did wrong to your little sister, so you should a________ to her for your fault.
(7)The custom of arranged marriages still _________(存在)in many countries.
(8)Evidence gained from observation and experiment is often used to _______(证实)a scientific theory.
(9)I’m taking a course on political _________(理论).
(10)Smoking is extremely h_________ to your health.