___________there are many different types of food, some animals spend their lives eating only one type.
| A．Since | B．Unless | C．Once | D．While |
— 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 |
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 |
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 |
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 rainy season is coming and let’s make full use of the ________ days to dry whatever is needed to dry before the next dry season.
| A．few last sunny | B．last few sunny |
| C．last sunny few | D．sunny last few |