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

Some plants are so difficult to grow that they can only ______ in a perfectly clean environment.

_______made Daisy wild with joy—Her success in the A-level exam this year.

They said they are twin brothers. No wonder they haveso many things _______.

If you want to know the meaning of the word _______, you ’d better look it up in the dictionary.