英语 用正确的介词或副词填空

英语 用正确的介词或副词填空
we learned_________how to look after pets
they listened to a talk _________the computer
the elephant weighs_________ _________780kg
is English very different_________French?
don't feed the monkeys_________the dirty food
don't read _________the sun,it's bad_________your eyes
can you tell me what the talk was_________?