Don’t call him at this time tomorrow, because he _________ a meeting with his teachers.

He threw away his cup and became even happier. Which of the following is correct for the underlined word in the sentence

The weather turned out to be fine yesterday. I _______ have taken the trouble to carry my umbrella with me.

He doesn’t drive his car ______, so he always has traffic accidents.

China ________ the developing countries in the world .