We can’t see ______ flowers in the picture.

A lot of trees________ around here every year, and we can enjoy fresher air now.

We consider ____ absolutely necessary that we should open our door to the outside world.

The books are so nice, which one can I take? —Oh, you can take _______ of them. I’ll keep none.

I have no idea whether he ______ to the cinema tomorrow. —He will go if it ______. [ ]