My grandmother is over 90, but she is still in good health and stay ___________.

It is reported the weather will _____ hot for a long time. —I hopenot. I hate hot weather.

I didn’t know it _______ you told me.

Half of the workers here ______ under twenty _______. [ ]

We have been expecting Rio 2016 Olympics_______ the Olympic flame(圣火) was lit.