According to the agreement, nobody _______ let out how they spent the three days in the cave.
Sir, you ______be sitting in this waiting-room. It is for women and children only.
The man who thought of ______a gas engine _____ wheels was the inventor of the automobiles.
The company was named Gates Hall ______ a man named James Gates.
When we were young, every evening my brother and I ______ stay at home waiting for our mother to come back from work.
----Who______ it be that is knocking at the door? ----It ______ be Father, but I’m not sure.