—Please _________ the tigers. It’s dangerous to take photos with them.—Oh, I see. Thank you.
--Thank you very much. --Not at all , I was____________ glad to help.
I would have come to see you earlier, but I__________too busy.
With summer coming on, the weather gets hot _________.
In Switzerland, six miles west of Geneva,___________ a collection of laboratory buildings.
America was____________ was first called" India" by Columbus