assisted the professor inassisted in//assist us in
(4)He can walk only ________________________ crutches.他只能靠一副拐杖走路。(5)Despite his cries, no one ________________________.尽管他喊叫,。
with the assistance ofcame to his assistance
2.concentrate vt. concentration n. 专心;专注 concentrate (sth.) on (doing) sth. 集中于;专心于…… concentrate one‘s attention/efforts/thoughts on... 把注意力/努力/思想集中到…… be concentrated in/on/upon sth. 集中于,
[即学即练2](1)We should ____________ all our effort ______ improving education. 我们应该致力于改进教育工作。(2)He _______________ the study of English. 他把重点放在英语学习上。(3)Our population __________________ the big cities. 我国人口集中在大城市里。
Concentrate onconcentrated on//is concentrated in
拓展:focus/fix one‘s attention on... 集中注意力于…… put one’s mind/heart in (into) 专心于…… be absorbed in... 一心一意于…… apply oneself/one‘s mind to... 专心于…… pay attention to 专心,注意…… 以上短语中 in, to 都是介词,后接名词或动名词。
3.acquire vt.
[即学即练3](1)I managed to __________________ for the concert.我设法弄到了两张音乐会的票。(2)She ________________________ French. 她学会了法语。(3)Mr Brown __________________ in the oil business. 布朗先生在石油生意上发了财。
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