5.We worked very hard for the exam.Then we passed it.
-->Before
6.First my sister considered what to say.Then she decided to talk to her headmaster.
-->After
7.I learned my lessons.Then I went out for a walk
-->Before
8.Her brother bought a new washing machine.First he checked the prices
-->After
9.My mother took an aspirin.Then she felt a little better.
-->Before
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Sinh Học lớp 12
