If he ____ on tourists for his business,he would have to close his shop.
A. depends
B. will depend
C. depended
D. had depended
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He built a telescope ____ he could study the skies in his free time.
It is imperative that you ____ here in time.
A. shall arive
B. must arrive
C. could arrive
D. arrive
There are two _____ in our school
A. library
B. libraries
C. librarys
Thank you for your help,_____ we could not have finished the work in time.