People have planted a great many trees in order to ____wind and sand in the desert.

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If not If so If no so If don’t

to have a great many of to be a good many of to have a great many to be a great many

If not If so If not so If don’t

hold down hold up hold back hold out

have been planted; how were planted; what were planted; how have been planted; what

having planted planted have been planted to be planted

were planted have planted have been planted planted

The number of; has been planted A.great number of; have been planted A. great number of; has been planted A. great number of; have planted

have been planted; how were planted; what were planted; how have been planted; what

have been planted were planted have planted had planted

hold down hold up hold back hold out

planted are planted were planted will be planted

are planted have planted will plant have been planted

have been planted will be planted have planted will plant

The number of; has been planted A.great number of; have been planted A.great number of; has been planted The number of; have planted

The number of; has been planted A great number of; have been planted A.great number of; has been planted A.great number of; have planted

have been planted were planted have planted had planted