It is usually not quite cold in this area in March, but sometimes temperature __________be very low.

Without the air to hold some of the sun’s heat, the earth at night_____very cold, too cold for us to live. 

The captain urged that the mission ________ before dark.

With economy increasing steadily, people ______ enjoy a life of higher quality.

—Hi, Tom, Any idea where Jane is? — She __ in the classroom. I saw her there just now.