1.   I was really scared, the atmosphere became very stiff but nobody said anything.

2.   The atmosphere became increasingly raucous.

3.   Ballater, in the last few minutes of his visit, praised his performance as a pianist and the atmosphere became more cordial.

4.   As exceptionally chilly air arrives aloft at high altitudes, the atmosphere will become unstable, increasing the risk for isolated weak tornadoes or coastal waterspouts.

5.   As the atmosphere becomes increasingly unstable on warm, humid, sunny days, thunderstorms often erupt.

6.   As the night wears on, the atmosphere becomes increasingly hallucinatory.

7.   As you move farther from the ground, the atmosphere becomes unstable.

8.   At points, the serious atmosphere becomes a little tiresome.

9.   Rocketdyne engineers monitored the mission around the clock from the engineering support room at the DeSoto Avenue facility, and the atmosphere became tense late in the afternoon.

10.   The atmosphere is becoming toxic.