第一节：单项填空（共20小题；每小题1分，满分20分）
1．Most parents now tend to consider ______environmental safety of ______product before they buy it for their children.
A. the ,the B. an, an C. the , an D. the , a
2. --May I play soccer now, mum?
--No. I’d rather you _____. You ____ finish your homework first.
A. wouldn’t; must B. didn’t; shall C. won’t; shall D. didn’t; will
3. ____teenagers eager to keep in touch with their friends, a mobile phone has become a must for them.
A. For B. To C. With D. As
