My friend Jack was very sick with a strange fever; _____, he could neither eat nor sleep.[ ]

Why not wear your miniskirt, Rose? — Well, my legs are too thick, if you ______ know.

Silk from China found its way to India, the Middle East and Rome, _______ spices and glass, which was not known to China

We can use MSN to talk with each other on the Internet.—Really Will you please show me ________ it

He is new here， so we know about him.