It___be the postman at the door.It’s only six o’clock
A student should not ______ small errors, which might lead to serious mistakes in the future.
— ______ I’m very busy now. Could I call you back after work?—OK. I'll wait for you.
It is not right for you to ______ fifty dollars from my salary without any good reason. You should give it back to me.
—Why do you drink so much coffee?—Well, ______ it doesn't keep me awake at night, I see no harm in it.
You can't avoid ______ your job tomorrow ______ you work hard today.