she tried to be serious but she couldn't help ( laughing/to laugh/that she laugh)
i like( cleaning / clean/to clean/that i clean) the kitchen as often as possilbe
i'm sure you'll have no( difficulty to pass/difficuties to pass/difficulties passing/ difficulty passing) the exam
the path was icy, so we walked very carefully. we were afraid ( of falling/from falling/ to fall)
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Sinh Học lớp 12
