6 . John and Sandy argued all the time, ______ completely ruined the evening for the rest of us.

A．who

B．which

C．whom

D．that

7 . My mother was too busy to remember my birthday, ________ made me a little upset.

A．which

B．that

C．whom

D．what

8 . Until ________, the money won’t go to another ambitious investment plan, ________ is run by high-achieving stockbrokers.

A．recovering; which	B．recovered, one
C．having been recovered; which	D．having been recovered, that

9 . Edison________ questions, ________made his teacher very angry.

A．always asked, that	B．was always asking, which
C．has always asked, which	D．had always asked, that

10 . These days, teachers have been sparing no efforts to create         they hope will be the best means to improve the efficiency of online teaching,         some students don’t notice or care about, though.

A．that, which

B．what, which

C．which, what

D．what, that