______ a light when necessary. You will bring light to other people and yourself.

_____they have a car? —-Yes, they _______.

Take one more pen. If your pen doesn’t work during the exam, you can use the other one.－ OK, Mum. You are always_______.

They still can’t decide ________ with our difficulties in learning math.

Really?Who will give lecture?—Mr Wang, famous professor from Nanjing University.