-Our government is doing _______ to protect the environment. -That’s great.
Email is very popular today. People ______write letters to each other now.
Difficulties are nothing _____we are not afraid of them.
—What did your father ask you just now? —He asked me ______.
_____the doctors in the hospital is about100 and one fourth of them are _______doctors.
We will go out for a picnic if it _____tomorrow.