As we advanced up the valley, the tree cover gradually grew more sparse.

This is followed by a more level tract in which the hills grow sparser.

For an hour they flew and then the sunflowers grew sparse.

The reports from our agents are growing steadily sparser and less detailed.

"Traffic must have grown sparse, or we'd not see random variations."

Hair may well grow back finer and more sparse.

Traffic grew closer and trees sparser until she entered a glade which ran down to the road.

Attendance at Prayer grows ever more sparse, but turnout in elections for president has remained high.

They passed a few abandoned settlements; even the hardy cow-trees grew sparse here.

The houses grew sparse, until only the occasional cottage dotted the rocky landscape.