根据文章内容填入适当的词 Yesterday, I met with Mr．Yang．Several years ago, he was a professor

根据文章内容填入适当的词

Yesterday, I met with Mr．Yang．Several years ago, he was a professor of the ________ in Beijing University．He had taught physics there for 20 years．He ________　________ give speeches around many other famous universities．Last year, he went abroad to teach in a university．There he didn’t stop studying, and he made an important discovery in the ________ of physics．This year he came back to China．I asked why he returned to China．He answered with a smile, “Because I am a Chinese．I am supposed to ________　________　________ our own country．I belong to China．”

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