Definition: not sleeping Level: B1
我发现历史课上很难保持清醒。
I find it so difficult to stay ___awake during history lessons.
我喝很多咖啡来保持清醒。
I drink a lot of coffee to keep me ___awake.
她感到非常紧张，以至于晚上睡不着。
She felt so nervous that it kept her ___awake at night.
