Can you climb that tree, my boy? — __________ ?

By the time I saw the angry expression onhis face, I ______ exactly what I was having to face. But not for a moment______ I should quit.

What’s your plan for the coming weekend— ___________.

What on earth are the police busy with— They have been investigating how the train crash __________

They didn’t ______ the true meaning of what the boss had said, and thus their task almost completely failed. [ ]