Circle the letter A,B,C or D to indicate the corrects answer to each of the following questions.
1. John has _____his new pen since yesterday, but he hasn't found it yet.
A. looked up B. looked for C. looked after D. looked into
2. The film_______ we saw last week was much better than this one.
A. When B. who C. whom D.which
3. Recently a lot of young people _______ charity work in their free time.
A. are taken up B. are taking up C. have taken up D. took up