单项选择题
The director had her assistant （） some hot dogs for the staff members.
A．picked up B．picks up C．pick up D．picking up
单项选择题 Before building a house, you will have to （） the government's permission.
单项选择题 In time of trouble Charlie could always （） a solution.
单项选择题 By the time you finish your homework, all of us （） ours at hand, I'm sure.
