In some speech community, two languages are used side by side with each having a different role to play, this is______.

单项选择题We may hear children say what he wants . This is an example of______.

单项选择题According to the writer which of the following is put of chivalry A knight should______

单项选择题Buckingham Palace is______ 's present London home.

单项选择题The largest and smallest states of the United States are______.

单项选择题Japanese attacked the Pearl Harbor in______.