No student ________ go out of the school campus after 10：00 at night without permission according to the school regulations.
A. shall B. must
C. should D. would
Only after one loses something ________ how precious it is.
A．he will realizeB．will he realize
C．he has realizedD．has he realized
Life is like riding a bicycle. _____ your balance, you must keep moving.
A. To keepB. Keeping
C. Being keptD. Having kept
Peter, though a green hand, has earned not only the trust of his fellow workers but also ________ of his boss.
A．one B．ones
C．that D．those
A few stars from the entertainment industry, such as Ke Zhendong and Fang zuming, have recently been arrested, which shows that drug taking is becoming _____ increasingly serious threat to society.
A. the B. an
C. a D. 不填
目前青少年压力过大，为排解压力一些青少年染上了一些恶习，如吸烟，饮酒、吃垃圾食品、上网成瘾等，请你以学生会的名义参照以下提示用英语写一封倡议书，呼吁中学生要“养成好习惯，过健康生活”。要点如下：
1．青少年中存在的恶习以及它们的危害。（恶习和危害各至少2点）
2．好习惯的重要性和必要性。（至少2点）
3. 呼吁你校学生养成好习惯，过健康生活。
注意：
1. 词数120左右，开头语已为你写好, 其词数不计入总数；
2. 可以适当增加细节，以使行文连贯；
3. 文中不得透露个人姓名和学校名称。
