Scientists have found no ________of life on Mars so far,though great efforts have made on the research.
| A．symbols | B．signs | C．marks | D．signals |
Do tell me the way you think of_____ the problem as soon as possible.
| A．to solve | B．solving | C．solve | D．being solved |
------ I ‘m going to join them in the play.
------- ______.
A. Have a pleasure B. That’s a very nice of youＣ. Have fun D. Have a fun
With the change of the economic foundation the entire immense superstructure is _____ rapidly transformed.
| A．anything but | B．more or less | C．at large | D．any more |
These desks and chairs can be ___ to the height of any child.
| A．adjusted | B．adapted | C．fit | D．adopted |
I really don’t know for certain____ they discussed.this important event very secretly.
| A．where was it that | B．where it was that | C．where that | D．it was where that |