The teacher talked with Jack, _______ problems was poor study habits.
| A．whose | B．which |
| C．one of whose | D．one of which |
_______ is expected, according to the online survey, is _______ the price of housing will not go up any more.
| A．As; what | B．It; that | C．What; that | D．What; which |
-----Alice, you clean the blackboard today, _________?
----- But I cleaned it yesterday.
| A．won’t you | B．will you | C．didn’t you | D．don’t you |
---- Why is the cake so expensive?
---- Maybe you don’t know a cake made of wheat costs less than _____ made of rice.
| A．one | B．that | C．the one | D．another |
I _____ sooner but I didn’t know that they were waiting for me .
| A．had come | B．was coming | C．would come | D．would have come |
Experiments of this kind ___in both the U．S and Europe well before the Second World War．
| A．had conducted | B．have conducted |
| C．have been conducted | D． had been conducted |