16. We ________ (sing) too much last night - I have a sore throat!
sang
sing
are singing
will sing
17. The phone is ringing. I ____________(answer) it.
am going to answer
am answering
will answer
answer
18. I've bought a new book. Tonight I ___________(stay) at home and start reading it.
will stay
am going to stay
won't stay
am not going to stay