21．---Shall I tell your best friends what happened to you yesterday?
— they ask you．
| A．Not if | B．Not unless | C．Not except | D．Not though |
His business failure left him at the edge of desperation, but, , he managed to go out of the shadow through years of efforts.
| A．time and tide wait for no man | B．don’t count your chickens before they are hatched |
| C．no pains, no gains | D．time heals all wounds |
Canada is a country many different nationalities as well as one with foreign immigrants the majority of its population.
| A．making up of; occupied with | B．consisting of; making up |
| C．made up of; consists of | D．consisted of; taking up |
--- Has your father returned from Africa yet?
--- Yes, but he here for only three days before his company sent him to Australia.
| A．was | B．has been | C．will be | D．would be |
There are varieties of programs in the TV station to many different types of interests and tastes among the public.
| A．cater to | B．appeal to | C．apply to | D．adjust to |
The idea for the new plan came to his mind, to his experiment in the lab.
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |