chia đông từ  1. My mother (come).................. to stay with us next weekend  2. Where you (spend)................... your holidays next summer? 3. Violets (bloom)................................. in spring 4. They (prepare)................................ the Chrisstmas dinner at the moment 5. When he lived in Manchester. he (work)....................... in a bank 6. Birds (buil).................................... their nests in summer and (fly)................. to the south in winter 7. I (lose)............................ my key. (can)................... you help me look for it? 8. My brother (join)................ the army when he (be)................. young 9. Miss Lee often (write).............................. when he (be)............... young 10. He (leave).................................. home two weeks ago 11. You (speak).................... to Mrs. Bakers yesterday? 12. Columbus (discover)...................................... America more than 400 years old