---How’s your tour around the North Lake? Is it beautiful? ---It __________ be, but it is now heavily polluted.
It is a great pleasure for a woman to ________ the price while shopping.
. ______ the ancient Egyptians built the pyramids puzzled people for centuries.
No one but the experts in this field can _____ the difference between them.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
The meeting we had ________ to _______ us finally.