.—Did you visit the museum? —No, we ____ it, but we spent too much time shopping.
Can you solve such problems ___raised by the audience?
We often think of the days ___we spent together on the island.
Air, _ __we breathe every day, is around us all the time.
The radio set __ _ last week has been out of order.
He is a man of great knowledge, ___much can be learned.