It is these poisonous products ______can cause the symptom of the flu, such as the headache and aching muscles.
We are said to be living in ____ Information Age, ___ time of new discoveries and great changes.
—Hi, Terry, can I use your computer for a while this afternoon?—Sorry. ______
It was when she was about to go to bed ______the telephone rang.
When _____ to hand in his homework, Philip told his teacher that he had left it home.
It was ______ that I didn’t like to leave my room.