Is this the reason _________ at the meeting for his carelessness in his work?

[　　]

A．he explained

B．what he explained

C．how he explained

D．why he explained

Recently I bought an ancient Chinese vase, __________ was very reasonable．

[　　]

A．which price

B．the price of which

C．its price

D．the price of whose

Rainforest _________ and burned at such a speed that they will disappear from the earth in the near future．

[　　]

The bell _________ the end of the period rang， _________ our heated discussion．

[　　]

A．indicating；interrupting

B．indicated；interrupting

C．indicating；interrupted

D．indicated；interrupted

The sign reads “In case of __________ fire，break the glass and push _________ red button．”

[　　]

A left-luggage office is a place where bags _________ be left for a short time, especially at a railway station.

[　　]

--How much did you ________ for the glasses, Kate?

--Five dollars.

[　　]

--When will you fly to Sydney?

--Pardon?

--I ask you ________.

[　　]

A．when will you fly to Sydney

B．whether you will fly to Sydney

C．that you will fly to Sydney

D．when you will fly to Sydney

--The population of France is ________ than ________ Canada.

--I think so.

[　　]

--It's ________ Tree Planting Day next Sunday. Shall we plant trees on the hill?

--_________.

[　　]

A．the; OK

B．x; Yes, we shall

C．x; Good idea

D．the; No, I don't think so