Betty goes to learn how to play the violin every afternoon _____ Saturday and Sunday. She does the housework on these two days.

Hey! Peter, guess _____________ for my coming vacation．— To Qingdao You always like somewhere interesting．

－Food safety is a big problem now.－______, the government has taken some steps to solve it.

________ nearly all behavior is learned behavior is a basic assumption ________ has been put forward by social scientists

That’s the third time he’s won the award in this field. — Yes. He ______ his maximum potential in the past decade.