单项选择题
A. Leave them to a baby-sitter. B. Leave them in a day-care center. C. Leave them with other children with a care of an adult. D. Leave them in a kindergarten.
A. Sell stamps and envelopes. B. Go to the bank. C. Look for an off-campus post office. D. Go to the student union building.
A.two thousand B.four thousand C.six thousand D.ten thousand