Many countries are now setting up national parks _ animals and plants can be protected.
He had a lot of friends, only a few of ______ invited to his wedding.
“John took a photograph of you just now.” “Oh, really? I ______.”
The buses, most of _______ were already full, were surrounded by an angry crowd.
When I arrived at the company, the manager ______, so we had only time for a few words.
David is such a good boy _______ all the teachers like.