Gun control is a subject ______Americans have argued for a long time.
| A．of which | B．with which | C．about which | D．into which |
I saw no more than one copy left in the bookshop. Will you go and buy ______?
| A．it | B．some | C．any | D．one |
Does _______ matter if he can’t finish the job on time?
| A．this | B．it | C．he | D．that |
I don’t think _______ possible to master a foreign language without much memory work.
| A．it | B．that | C．its | D．this |
Therearetworoadsandeither ________tothestation.
| A．leads | B．lead | C．areleading | D．isleading |
Whenandwherethistookplace_________stillunknown.
| A．are | B．were | C．is | D．has |