— Can you imagine what is Jack doing now? He is playing football outside while everyone else is busy in class!— He　　　　 his homework, I think.

It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off．

Thank you so much! But for your text message, I ______  home without my ID card yesterday.

 When he saw all his books _____ here and there on the floor, he knew that something terrible _____. 

We ________ jump to conclusions before we have all the facts.