William suggested _____ a party for Elizabeth who was going to retire soon.

（ ） some mammals came to live in the sea is now known.

The first question we will discuss is _____ we should go there so early tomorrow.

Yon don’t have the right to blame me _____ being late， for I was busy typing your business invitations.

It is important that the boy （ ） an adult to take care of him.

I used to smoke _____ but I gave it up 3 years ago.

_____ that the earth was flat?

We’re talking about the piano and the pianist （ ） were in the concert we attended last night.

Do you mean this is the_____decision you have made after thinking for hours?

Bob never dreams of （ ） for him to be promoted to the managing position in the company.

In the experiment we kept a watchful eye （ ） the developments and recorded every detail.

Fast food doesn’t seem like a good idea, for it is （ ）.