—I knocked but nobody answered the door.
----They _____asleep then and didn’t hear you.
| A．must be | B．should be | C．must have been | D．should have been |
The poor man stood there, with his hands ____, ____ his eyes upon the dark cave.
| A．crossed, fixing | B．crossing, fixing | C．crossed, fixed | D．crossing, fixed |
Please put on more clothes. It is ___ that it will be a bit colder this afternoon.
| A．likely | B．sure | C．certainly | D．perhaps |
Great changes have taken place in that school. It is no longer ___ it was 20 years ago, ___ it was so poorly equipped.
| A．what, when | B．that, which | C．what, which | D．which, that |
This book will show you ________ can be used in other contexts.
| A．how you have observed | B．how what you have observed |
| C．that you have observed | D．how that you have observed |
---Do you mind my smoking here?
--- __________. Look at the sign! It says, "No smoking!"
| A．Never mind. | B．Of course. | C．You’d better not. | D．No, I don’t. |