We wonder ________.

[　　]

A．whose dictionary this is

B．this is whose dictionary

C．who's dictionary this is

D．whose dictionary is this

I don't know ________ they've invited to our English party.

[　　]

I took it for granted ________ he would approve of the idea.

[　　]

We believe ________ possible ________ she'll arrive on time.

[　　]

The boss asked him to explain ________ he was two and half hours late.

[　　]

The doctor asked the patient ________ he felt.

[　　]

The teacher ________ oxygen ________ a gas.

[　　]

-Why can't I swim in the lake, Daddy? The water looks beautiful.