Circle and correct the mistake in each of the following sentences

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Exercise 12. Circle and correct the mistake in each of the following sentences.
1. Thanks to the development of technology, ploughing machine can plough very much more
fastly than a buffalo.
A. ploughing
B. can
C. much
2. Harvest time is often more busy and harder for farmers.
A. Harvest
B. is
C. more busy
D. harder
3. The streets in the city are much crowded than those in the countryside.
A. in
B. are
C. crowded
D. those
4. Last summer holiday, I had a very forgettable time in my hometown when I spent a lot of
time flying kites on the field with my old friends.
A. a
B. forgettable C. when
D. flying
5. Although Jane lives in a small village, her house is comfortably furniture.
A. Although
B. in
C. comfortably
D. furniture
6. In my view, villagers think more optimistic than city-dwellers.
B. more
A. In my view
C. optimistic
D. than
7. My family has lived happilier in the country than in the big city since last year.
B. happier
C. than
A. has lived
D. since
8. A tractor can plough welly than a buffalo or a horse.
A. can
B. welly
C. than
D. more fastly
D. or