hat do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.

This is useful machine which was made in ________thirteenth century

I’m going to Zhenjiang _________Monday morning. [ ]

_____ do the students do after-school activities every day ? For more than one hour.[ ]

______ month of the year is May.