Choose the right alternative:
1)They are not jumping_____ the trampoline
a .in
b. on
c. at
2)She_____________ in the library.
a. is study
b. studying
c. is studying
3)He is very good__________ biology
a. in
b. at
c. on
1)They are not jumping_____ the trampoline
a .in
b. on
c. at
2)She_____________ in the library.
a. is study
b. studying
c. is studying
3)He is very good__________ biology
a. in
b. at
c. on
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2) she IS STUDYING..
3) he is very good ON...
não tenho certeza quanto a 1) e a 3) mas espero que ajude