你可以在这些东西中随意选择。You can make a(n)__________ among the things.
Before traveling in space, you must know what it might feel like_____in an imaginary environment.
She's really _____ yoga these days - she does three classes a week.
Since you can solve the problem,I don’t feel_____worthwhile taking such trouble.
The scientists are studying the effects of human activities______the environment.
The law about banning using thin plastic bags came into_____from 1st Jane this year.