7. Where does Fred meet Ann? A. At Brown’s house. B. In the hospital. C. At the station. D. At Kay’s house. 8. How many hours a week does Fred do his part—time job? A. Five h
Everyone wants to be self-confident, but maybe we just don’t know how to be. Here are some tips on how you can feel more confident about yourself. 71 Everyone has shortcomings. When you have
Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock? A. off; back B. up; off C. out; up D. back; off
=0.005 mol；硫的质量分数为
×100%=36.36%。