Even in winter the roadsides were places of beauty, _______ countless birds came to feed on the berries and on the seed heads of the dried weeds rising above the snow.
| A．which | B．when | C．where | D．what |
So many directors ________, the board meeting had to be put off.
| A．were absent | B．been absent | C．had been absent | D．being absent |
The little boy is dirty from head to foot because he ________ in the mud all morning.
| A．has played | B．is playing | C．has been playing | D．was playing |
.The new dictionaries are very useful. They ________ well and ________ already .
| A．sell; have been sold out | B．sold; had sold out |
| C．sell; sell out | D．are sold; have been sold out |
— We want someone to design the new art museum for us.
— ________ the young fellow have a try?
| A．May | B．Shall | C．Will | D．Need |
This is an illness that can result in total blindness ________ left untreated.
| A．after | B．if | C．since | D．unless |