单项选择题
We will put off the picnic until next month（）the weather may be better.
A．where B．that C．when D．which
单项选择题 Let's discuss only such questions（）concerned everyone of us.
单项选择题 The two elements（）water is made are oxygen and hydrogen.
单项选择题 （）is announced in today's papers, the Shanghai Export Commodities Fair is also open on this Sunday.
