19.Tony is a determined person.________ he has a dream,he will try his best to realize it.( )
A. | Unless | B. | Since | C. | Once | D. | While |
15.I wonder whether his hearing is okay ______ he has turned the television up very loud.( )
A. | unless | B. | although | C. | until | D. | because |
13.You will never be successful _____ you are fully devoted to you work.( )
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A. | because | B. | unless | C. | if | D. | when |