No one knows exactly ______ this important discovery was made.
| A．that | B．that how | C．what | D．when |
Your floor is dirty. It needs _______.
| A．clean | B．to clean | C．cleaning | D．cleaned |
. ---Here you go. There are______ such cards here.
--- I only need ______ these cards in the box.
| A．five dozens; one dozen | B．five dozens of; one dozen of |
| C．five dozen ; one dozen | D．dozens of ; one dozen of |
---Listen! The fire engine is roaring! (消防车吼叫)
--- Oh, there ______ be a fire somewhere. How terrible!
| A．should | B．must | C．have to | D．will |
The robber can’t escape _______ this time. We have got much evidence to prove his crime.
| A．treatment | B．agreement | C．punishment | D．movement |
______ is believed that morning exercise is one of the best ways for a person to keep fit.
| A．What | B．As | C．It | D．That |