giúp mình chia ĐT với: 1. he left us 3 hours ago. By now he must (be) at home 2. Oh! there is much remains (do) 3. if only he (know) then that the disease was curable 4. (call) early, I found her at home 5. we watched the man (saw) the tree as we were walking away 6. (tell) not to say anything, she refused to answer his question 7. (get) that new, she became frightened 8. they had gone, there is nothing (leave) 9. a boy (call) Peter sent her a letter 10. the soldier (injure) in the fight was taken to hospital 11. the (break) window hasn't been mended yet 12. (fail) twice, he doesn't want to sit for exam once more