they are w____ at using the language in social situations

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theyarew____atusingthelanguageinsocialsituationstheyarew____atusingthelanguageinsocialsituationsthey

they are w____ at using the language in social situations
they are w____ at using the language in social situations

they are w____ at using the language in social situations
working
work at 从事,致力于,钻研

The boys are sitting in front of the TV set. They are watching TV. The boys are s_iting_in f_ront___of the TV set. They are w_

worked