—What do you think we can do for our aged parents?—You __________ do anything except to be with them and be yourself

He insisted that the sky ____ clear up the following day. 

So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.

We __________ booked. Look, this restaurant is almost empty.

---Why not join us in the game?---I’d love to, but Mother insists that I _________ all my homework first.