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

A．that

B．how

C．who

D．what

3 . The student completed this experiment to make come true ________ Professor Joseph had said. (用适当的词填空)

4 . Mr Mike didn't understand ________it was that made his wife so upset this morning. (用适当的词填空)

5 . With these inspiring words ringing in their ears, Allied soldiers prepared for ________ would become known as D-Day. (用适当的词填空)

7 . Every employee needs to find their unique value contribution that makes them stand out in ________ is their field of employment. (用适当的词填空)

8 . Over thousands of years, they began to depend less on _________ could be hunted or gathered from the wild, and more on animals they had raised and crops they had sown.

A．whether

B．what

C．when

D．where

9 . Susan made it clear to me________she wished to make a new life for herself. （用适当的词填空）