________ interested me most was ________ he came from Australia, an English-speaking country.

[　　]

Coal can be used to ________, so we used to ________ with coal, but today we are used to ________ with gas.

[　　]

A．cook; cook; cooking

B．cooking; cook; cook

C．cook; cooking; cooking

D．cooking; cooking; cook

________ our disappointment, Mr. Black is absent ________ his office.

[　　]

________ from heart trouble for years, Professor White has to take some medicine with him wherever he goes.

[　　]

The number ad people invited ________ fifty, but a number of them ________ absent for different reasons.

[　　]

The boy is not ________ to dress himself.

[　　]

They have brought us ________ such mineral dint.

[　　]

In warm countries, many people have houses ________ bamboo.

[　　]

________ since the night before, he felt very hungry now.

[　　]

A．Having rat eaten anything

B．Not eating anything

C．He hadn't eaten anything

D．Not having eaten anything

________ the sentence again and again, but I still can't understand it.

[　　]

A．Having read

B．Having been read

C．I have read

D．Although I have read