23.They are
teachers and don’ t realize_______to start and run a company.
| A．what takes it | B．what they take | C．what takes them | D．what it takes |
Hundreds of species are declared to _____ in the coming century.
| A．die away | B．die out | C．die down | D．die off |
It was playing computer games ____ cost the boy plenty of time ____ he ought to have spent doing his lessons.
| A．what; that | B．that; when | C．which; that | D．that; that |
We _____ live in a small flat but last year we bought a house.
| A．would | B．had to | C．used to | D．ought to |
All these gifts must be mailed immediately_________ in time for Christmas.
| A．in order to have received | B．in order to receive |
| C．so as to be received | D．so as to be receiving |
------Excuse me, sir, where is Room 301?
----- Just a minute, I’ll have Bob_______ you to your room.
| A．show | B．shows | C．to show | D．showing |