.The teacher demanded that our examination paper _____handed in at once . A be B must be C would be D had to be
The Niagara Fall is great tourist _______, drawing millions of visitors from all over the world every year.
---Who was the man talking to our manager in the hall yesterday? ---A man _______ himself a popular singer.
---Thanks for giving us a wonderful Chinese dinner, Miss Wang. ---_________.
Good ways of doing things can help us save time, and _____ it’s necessary for us to find them.
Tom____ me your secret, but he meant no harm.