He knew that cholera would never be controlled _____ its cause was found.
| A．till | B．still | C．until | D．kill |
. The workers do nothing but _______ tea and talk to each other.
| A．drinking | B．to drink | C．drink | D．are drinking |
Every year, a great many visitors come to visit the temple ______ the 12th century, ______ has brought a large income.
| A．dating from; which | B．dated from; which |
| C．which dates from; that | D．which dated from; which |
. She makes _______ effort to learn maths and she has made _______ great progress in it.
| A．an ; a | B．/ ; a | C．the ; / | D．an ; / |
.I shall never forget the day _______ Shen Zhou V was launched, _______ has a great effect on my life.
| A．when ; which | B．that ; which |
| C．which ; that | D．when ; that |
When and where to build the new factory _____ yet.
| A．have not decided | B．are not decided |
| C．has not decided | D．is not decided |