There are trees ____ all shapes on the hill.A: inB: ofC: atD: by

There are many trees on ______side of the river． A．both B．eitherC．allD．a

All the trees______ last summer.A、were plantedB、are plantingC、planted

There was snow everywhere, so that the shape of things was difficult to______.A．identifyB．

There are _____ in the sea.A．coral islands in all placesB．some coral islandsC．warm waterD．

______ for a long time, the ponds are all dried up and a lot of fish are dead.A．There has

As is known to all, there are many forms of energy, ______is solar energy.A．one of thatB．o