________ is believed ________ more and more people would fly to the moon in the future.
| A．That; like | B．This; as |
| C．It; that | D．Man; when |
You can only be sure of_________ you have at present; you cannot be sure of something _____ you might get in the future.
| A．that; what | B．what; / | C．which; that | D．/; that |
Could I speak to__________ is in charge of International Sales ,please?
| A．anyone | B．someone | C．whoever | D．nomatter who |
The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |
______ he referred to in his article was unknown to the general reader.
| A．That | B．What | C．Whether | D．Where |
____ matters most in learning English is enough practice.
| A．What | B．Why | C．Where | D．Which |