下面是关于Jim学习英语的三对句子。每对句子中,第一句是原句,第二句是对第一句的改写,要求根据原句和第二句中已经给出的部分用一至五个单词补全第二句。(注意,不能改变原句的意思。)

1. Jim has learned English for three years.

Jim began to learn English three years().

2. Jim studies English for two hours every evening.

Jim()two hours studying English every evening.

3. Jim speaks English better than anyone else in his class.

Jim speaks English better than the()students in his class.

James Watt()the steam engine.

A.was inventing

B.invented

C.had invented

D.has invented

Professor White contributed a lot to our community,().

A.teaching,writing,and lecturing

B.teaching,writing,and alecturer

C.a teacher,a writer,and lecturing

D.teaching,lecturing,and a writer

On my left()a wide river;on my right,a dark forest.

A.has been

B.was

C.are

D.would be