I couldn't imagine ________ difficult it was for these badly injured victims to make it to the hospital.

A．when B．how

C．what D．where

His writing is so confusing that it's difficult to make out ________ he is trying to express.

A．what is it B．what is it that

C．what is that D．what it is that

—Haven't I seen you some place before?

—Yes. That's ________ I don't go there anymore.

A．because B．how

C．why D．when

We have realized ________ she is expecting is just an opportunity to test her ability.

A．that B．which

C．what D．where

The Frenchman pointed to the spoon and asked me ________ to call that in Chinese.

A．whether B．where

C．which D．what

We believe ________ we can find out the wonder drugs to H7N9 bird flu.

A．when B．whether

C．what D．that

Life is ten percent ________ happens to you and ninety percent ________ you respond to it.

A．which; how B．what; what

C．that; that D．what; how

The problem is ________ sometimes when we are given something on a constant basis, we start to take them for granted and forget being thankful for what we already have.

A．that B．how

C．where D．which

—Sir, I feel it complicated to apply to a university abroad.

—Why not read our guide? This is ________ the relevant information is available.

A．what B．how

C．where D．why

The tour pal lost his way in the mountain; ________ made things worse was that it began to rain.

A．that B．what

C．which D．who