81. Some companies are thinking of ways to save natural _____ by making better use of the water used in the bathroom.
A. resources B. sources C. power D. energy
82. The remains of adventurer’s private airplane were reported _____, but the adventurer remained missing.
A. being found B. to be found C. having found D. to have been found
83. Before ____ on our camping trip, we made sure that we have plenty of food and water in store.
A. running out B. making out C. setting out D. working out
84. I think computers are extremely useful in our daily life and I certainly couldn’t live without __.
A. mine B. it C. which D. that
85. £­Do you know our school will be enlarged soon?