单项选择题
Grandpa（）to water the flowers now, It’s going to rain soon.
A.isn’t needing B.needn’t C.doesn’t need D.needs
单项选择题 Sign up for alerts（）your mobile phone or email.
单项选择题 Don’t（）secure websites using public Wi-Fi.
单项选择题 （）conduct a background check on the company, making as many phone calls and Internet searches as you can.
