__________ you have made a promise, you should carry it out.
| A．Once | B．Until | C．For | D．While |
E-mail, as well as the telephone, ___________ an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．play |
-- “____either you or he to go there?”
--“_____is.”
| A．Are; Both | B．Are; Neither | C．Is; Neither | D．Is; Each |
Can you imagine what difficulty people had this year ________ against the severe natural disasters?
| A．fighting | B．to fight | C．fought | D．Fight |
Many a student ________ failed in the biology exam，and Tom is the only one of them who ________ decided to give up the course.
| A．have；has | B．have；have | C．has；have | D．has；has |
MoYan was awarded the Nobel Prize in 2012, made one of the Chinese people’s long-held dreams come true.
| A．it | B．that |
| C．what | D．which |