With temperature ______ so rapidly, we could not go with the experiment.

The workers are planting some trees on ____ sides of the street. Although they are tired, ______ of them have a rest .

Information has been put forward more middle school graduates will be admitted into universities.[ ]

__________ his surprise, the woman __________ a baby is his mother.

How about your travel? — You can hardly imagine what difficulty we have had ______ the vast desert. [ ]