For many cities in the world,there is no room to spread out further,___New York is an example
The teacher demanded that the exam _____ before eleven.
You promised your friend a letter; you ought to ______ days ago.
Tell me how you work out the answer, _______ you?
“ Need he go?” “ Yes, he ______.”
“ Isn’t that Tom playing basketball?” “ It ______ be; he fell off the ladder yesterday and got badly hurt.”