The boy ______ blue pants _____ my student.A.in … is B.in … are C.on … has
—_______ does your mother go to England? —By plane.
You should ____ hard.
I like playing ______ pipa.
—You won the first prize in the last Physics competition once again. —___________. I made several mistakes.
Much attention should be paid ____ the wild animals as many of them are dying out.