_________ is known to all, the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |
I have no idea ______ measures the government will take to stop the river from being further polluted.
| A．which | B．what | C．that | D．whose |
Half of ______surveyed in 16 countries say they go first to their closest friends to share their deepest wishes and darkest fears.
| A．these | B．some | C．ones | D．those |
I don’t know the meaning of the poem, because I have little ______with modern society.
| A．resistance | B．acknowledgement | C．acquaintance | D．access |
Evidence has been found through years of study______children’s early sleeping problems are likely to continue when they grow up.
| A．why | B．how | C．whether | D．that |
--- Shall we go for a drink at one o’clock this afternoon?
--- ______. Will two o’clock be OK?
| A．Sure, it is up to you | B．Sure, no problem |
| C．Sorry, I can't make it | D．Sorry, I’m not available today |