Nobody can hear you ______you speak in a louder voice.
句意：除非你说话声音大一点，否则没人能听见。
考查连词辨析。unless除非；if如果，是否；when当……时候；after在……之后。根据句意可知如果不大声些说话，则没人能够听到，所以这里用连词“除非”unless引导条件状语从句，故选A。
Nobody can hear you ______you speak in a louder voice.
—I think I am the shyest in my class. What should I do?
—Be more active in class, ________ you can improve your ability to express yourself.
—Mary doesn’t like fish chicken
—Ben doesn’t like fish, he likes chicken very much.
The Chinese doctors went to Italy to help the patients________they knew it was dangerous.
_____ Jane_____ her brother is going to the movies this weekend. One of them has to stay at home to look after their sick mother.
— Work hard,____ your dream will come true.
—Well. 1 will do my best.
Little Mary says good night to her parents________ she goes to bed every day.
—Hello, Linda speaking. Who’s ____?
—Hello, this is Martin.
I find ____ necessary to learn about the customs of a country before you go there.
—Much personal information is stolen when people buy things on the Internet.
—Terrible! _____ must be done to keep the Internet safety.
