Mark the best option A, B, C or D to complete the sentences

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Mark the best option A, B, C or D to complete the sentences:
8. He studies hard . . he can get the scholarship.
C. so that
A. when
B. in order to
D. although
9. Paul Mauriat plays the piano. He is a ..
A. music
B. musical
C. musically
D. musician
10. The electric light bulb.. .by Edison in 1879.
C. was invented
I don't know exactly when.
C. unless
A. invented
B. is invented
D. has invented
11. She'll be coming tonight .
A. although
12. We stopped .
B. because
D. when
. bought some fruit.
B. but
A. and
C. or
D. so
13. I am very interested . . mathematics.
B. about
C. in
A. at
D. on
14. He
..to the supermarket to buy some fruit yesterday.
C. has gone
A. went
D. was going
15. Nothing is
A. bad
16. Life in the past is . .than I expected
B. goes
. than being stuck in a traffic jam.
B. badder
C. worse
D. better
A. difficult
B. more difficult
C. as difficult
D. most difficult