_________useful advice it is ?

— Kate, ________ forget to give my best wishes to your uncle. — Thanks, I will.

—— Hello,Zhu Hua.I’ll have to return to Canada because I’ve worked here for a year. —— ＿＿＿＿＿! 

______ left when you get to the end of the street. 

______ until the lights have turned to green.