The life of a high school student is usually active, exciting and full of fun, but it ______ be stressful sometimes.

At the conference, Premier Li Keqiang urged all the government departments ______ effective measures to improve work efficiency.

Oh, Janne, you’ve broken another glass. You ought ＿＿＿＿when you washed it. 

.---I didn't go to work yesterday because my car broke down. ---You ____ mine. I wasn't using it then.

 I am glad that you have managed to come. You ___ have brought wine. We’ve got plenty.