单项选择题

A．Watch for changes in weather.
B．Watch their altitude.
C．Check for weak spots in their balloons.
D．Test the strength of the ropes.
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单项选择题
A．Shopping for shoes.B．Writing an article.C．Reading the magazine.D．Studying for a chemistry test.
A．Shopping for shoes.
B．Writing an article.
C．Reading the magazine.
D．Studying for a chemistry test.
单项选择题
A．To put the homework on Don’s desk.B．To leave the master key for Don.C．To give Don’s students the next assignment.D．To call Don at the end of the afternoon.
A．To put the homework on Don’s desk.
B．To leave the master key for Don.
C．To give Don’s students the next assignment.
D．To call Don at the end of the afternoon.
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