twins look much like each other,but they are different _____ nature

Students in our school are encouraged to________more activities after class in order to broaden their knowledge.[ ]

ing to our teacher, we should takedetailed notes in class because they are more __________ than our memory

Good to see you again. It’s almost threeyears _______ we met last time.

What 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.