Driving in the mountains can be very dangerous. You can’t be ______careful.

In my opinion, Li Jianrou is one of ___________ skaters this year.

If you prefer the red evening dress, you’ll have pay ____ 30 dollars, because it’s made of silk.—Ok, here you are.

My parents usually take a walk ______ dinner to keep healthy.

Without his illness, our English teacher _______ to the zoo with us last Sunday.