So we must be careful when we use the Internet.

So we must be careful when we use the Internet. We must be careful when we（ ）the road. 填空 we must be careful when we___ the road When the fire d----- is high,we must be careful.We must not We must be very careful when we go across the m___ road We must ___(be) careful. We must be careful when you go _____（cross） the road. We must be careful when we play sports. 变为一般疑问句 We must be careful.怎么改祈使句 Something unusual seems ____,so we must be more careful,(hap when _a diary ,we must be careful about what to write down we --- be careful when we'er walkung across the road there'r