1. This (A) exercise was (B) more easy (C) than I (D) expected
Mistake: "more easy" should be "easier"
Corrected sentence: This exercise was easier than I expected.
2. (A) In the way (B) home, Bob (C) told me a (D) funny story
Mistake: "In the way" should be "On the way"
Corrected sentence: On the way home, Bob told me a funny story.
3. I'm rich, (A) but I am not as (B) richer (C) as my (D) friends
Mistake: "richer" is redundant after "as"
Corrected sentence: I'm rich, but I am not as rich as my friends.
4. (A) Your picture (B) is (C) colourfuler than mine. I think you're good (D) at painting
Mistake: "colourfuler" should be "more colorful"
Corrected sentence: Your picture is more colorful than mine. I think you're good at painting.
5. If you (A) want to be a big (B) man, you have (C) to eat (D) less
No mistake
6. You (A) should drive (B) carefullier, (C) otherwise you will (D) cause an accident
Mistake: "carefullier" should be "more carefully"
Corrected sentence: You should drive more carefully, otherwise you will cause an accident.
7. (A) Sam didn't (B) behave as (C) good as (D) Mike
Mistake: "good" should be "well"
Corrected sentence: Sam didn't behave as well as Mike.
8. I (A) felt so (B) bored, so (C) last week I went (D) in a trip to the countryside
Mistake: "in a trip" should be "on a trip"
Corrected sentence: I felt so bored, so last week I went on a trip to the countryside.
9. (A) Live in the (B) country is (C) more inconvenient than in (D) the city
Mistake: "Live in the country" should be "Living in the country"
Corrected sentence: Living in the country is more inconvenient than living in the city.
10. In (A) that test, Sam did (B) more well than you. Now (C) you should try (D) harder
Mistake: "more well" should be "better"
Corrected sentence: In that test, Sam did better than you. Now you should try harder.