My plant died. I _____watered（浇水)it.A.should haveB.must haveC.could have

Salty water is generally harmful ______ plants.A、forB、toC、withD、over

I like climbing mountains______ my brother prefers water sports.A．asB．whileC．whenD．for

What make the lake more beautiful ______ the lotus plants growing in the water.A．isB．areC．

I am very keen at plants,______？A．isn"t IB．ain"t IC．am ID．aren"t I

We thought the plants all died from lack of rain, and were delighted to see new______ appe

These apple trees ______I planted three years ago have not borne any fruit.A.thatB.whatC