—Look! The lights in the classroom are still on.—Oh, I forgot ________.
We should keep people from throwing rubbish into the sea______save the endangered sea animals.
A:Jim did really well in the exam. B:Yes. I think he studies_______of all the students.
Danny loves singing very much. We usually hear her_____after school.
A:Mum, how can I make the cake more delicious? B:Add some eggs and mix them_______milk.
--- What languages _____ in that country? ---- German and English