The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
| A．after | B．before | C．since | D．when |
A cell phone could ___________the energy which could activate your brain.
| A．give away | B．give off | C．give back | D．give up |
I think it a great honor ___________ to visit your country.
| A．to invite | B．inviting | C．having invited | D．to be invited |
— What do you think of modem music?
— It is often considered not as good as ___________ of the past.
| A．it | B．this | C．that | D．one |
Students ___________ remain in their seats until all the papers have been collected.
| A．may | B．shall | C．need | D．can |
__________strong earthquake struck __________ Yaan, Sichuan province on April 20, 2013.
| A．A; / | B．The; the | C．The; a | D．A; the |