(2012·浙江) According to scientists, mental abilities begin to __________ from the age of 27 after reaching the highest level at 22.
. The school rules state that no child ______ be allowed out of the school, unless accompanied by an adult. A will B. must C. shall D. may
. We’d like to do _______ we can _________ the poor.
Peter, I’m really grateful to you. Your advice is much more useful for me than ___ given by Mike.
. The ______ house is his.
–Shall we meet at 6:00 or at 6:30?-__________.