Hangzhou ________ as the City of Silk. Tourists like shopping for silk there.
A. knows B. is known C. was known D. will be known
Look at the picture. The top five TV plays ________ in it.
A. list B. are listed C. will list D. will be listed
You don't know whether the shoes fit you ________ you try them on.
A.if B.unless C.though D.when
To make your DIY work perfect, you'd better not start ________ you get all the tools ready.
A.when B.since C.before D.after
It has been five years________ I last saw my primary school classmate Lucy.
A.though B.until C.since D.before
________ the river is polluted, it will take years to become safe and clear again.
A.Once B.Although C.Until D.Unless
