New mineral resources may be discovered during the forthcoming Antarctic _____.

The government has lost a great deal of _____ because of the large increase in food pries.

The young lady has a ________ for helping disabled people.

Before he started work, I asked the builder to give me a(n)_______ of the cost of repairing the roof.

—Do I need to give a tip if I eat at a fast food restaurant in the United States? —Yes, it’s a common ______ to tip waiter in a restaurant.