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There are many trees on ______side of the river. A.both B.eitherC.allD.a
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All the trees______ last summer.A、were plantedB、are plantingC、planted
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There was snow everywhere, so that the shape of things was difficult to______.A.identifyB.
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There are _____ in the sea.A.coral islands in all placesB.some coral islandsC.warm waterD.
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______ for a long time, the ponds are all dried up and a lot of fish are dead.A.There has
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As is known to all, there are many forms of energy, ______is solar energy.A.one of thatB.o
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There are two great belts or ______ where ninety percent of all earthquakes take place; th