—____ the workers are very tired, ____they keep on working.— They are great. We must learn from them.
--- How can I learn English well, Miss Huang ? --- You should try ________ English every day.
--- What is Da Wei like? --- He is a tall boy ________ glasses.
My best friend is good at ________.
Beijing is one of ________ in China.
Wang Gang wants to be ________ swimmer but Simon wants to be ________ engineer.