广阔的沙漠一望无垠。

The vast ___desert stretches as far as the eye can see.

骆驼商队缓慢地穿过广阔的沙漠。

The camel caravan moved slowly across the vast ___desert.

沙漠里白天很热，晚上很冷。

It's very hot in the ___desert during the day and cold at night.