15. My sister _____________________ her book at the moment.
A. reads
B. read
C. are reading
D. is reading
16. There are two tigers ____________________the wall.
A. behind
B. in
C. on
D. between
17. I was with Elena at her house last night. I was at ___________________ last night .
A. Elena house
B. Elenas’ house
C. Elena’s house
D. Elenas’s house
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