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get through get across get down get around
they ask other teachers to read their students' papers they ask their students to list their sources of information they can sign up for the Internet service they search the Internet and compare papers
travels traveled would travel traveling
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in the corner, mark around the corner, marked in the corner, marking around the corner, be marked
left out was leaving out is being left out was left out
has given have given has been given have been given
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hang on hang around hang up hang together
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bringing back bringing together which brought around gathering around
are；is are，are is，are is，is
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