--- What do you think of the math problem ? --- It’s very hard and nobody has _______.

 If nobody breaks traffic rules and everyone is careful enough, most accidents can be 　　　.

Paul is friendly to us.He always___good solutions to our problems.

—As teenagers, we should _____ seats to anyone in need  when taking a bus.—I agree with you.

---Who’s the lady ________ in red?---I guess she is Lily’s mother by what she _______.