30．How long do you think it will be _____ we can find a new water source?
| A．after | B．before | C．when | D．Since |
It is said that the famous football star is now willing to play for_____ would pay him three million dollars a year.
| A．anyone | B．whomever | C．no matter who | D．Whoever |
He grabbed his suitcase and gave the impression ___he was boarding the Tokyo plane.
| A．when | B．where | C．that | D．what |
Go and get your coat. It’s ________ you left it.
| A．there | B．where | C．there where | D．where there |
I remember ________used to be a quiet village.
| A．when | B．how | C．where | D．what |
________ the 2020 Olympic Games will be held in Beijing is not known yet.
| A．Whenever | B．If | C．Whether | D．That |