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④These planets do not light of their own. ⑤The enemy were forced . give off to give in 答案 drop out退学，辍学(leave school/college)；退出，脱离 12. drop back/behind落在后面；后退；落后 drop off下降，减退 drop in on sb.顺便拜访某人 drop in at sp.顺便到访某地 (1)If you decide to do something，never drop out half way. 如果决定做某事，就不要半途而废。 (2)I thought I’d drop in on you while I was passing. 我曾想路过时顺便来看看你。 多维训练 用drop短语的正确形式填空 (1)Don’t the others on the trail in case you get lost. (2)On my way home I his house. (3)Her popularity has recently. (4)She started a degree but after only a year. drop behind dropped in at dropped off dropped out 答案 motivate vt.使有动机，促使，激发 13. 多维训练 单句语法填空 (1)The murder (motivate) by hatred. (2)There is a special motivation these actions. (3)Jack is an intelligent pupil，but he lacks (motivate). was motivated for motivation 答案 achievement n.完成；成就；功绩 14. 多维训练 (1)用achieve的正确形式填空 ① a high degree of proficiency in English as a foreign language is not a mysterious process without scientific basis. ②No matter how she tries，she can’t equal her sister’s | 
