完形填空。 I 1_________ writing a letter 2_________ my cousin. I write with a pen. I write 3_________ a piece of paper. 4_________ the top of the letter, I write the day. What day is it? It's Thursday, March 12th. I write my name at the bottom of 5_________ letter. I put my letter in 6_________ envelope. Now, I write the address on the envelope. 7_________ is my cousin's address? She lives 8_________ a house. Her address 9_________ 1539, 95 street in Ottawa, Canda. Now, I am 10_________ a stamp in the top, right corner of the envelope. All done! (     ) 1. A. is (     ) 2. A. on (     ) 3. A. on (     ) 4. A. At (     ) 5. A. a (     ) 6. A. a (     ) 7. A. How (     ) 8. A. in (     ) 9. A. is (     ) 10. A. put B. are B. at B. with B. On B. an B. an B. Where B. on B. are B. puts C. am C. in C. at C. Up C. the C. the C. Who C. at C. do C. puting D. do D. to D. in D. With D. / D. / D. What D. with D. does D. putting