【正文】
1. __________are you doing? A. Who B. Where C. What 2. They______jumping. A. are B. IS C. am 3. He is _____a letter. B. writing C. writein 4. Let39。 1. watch TV ______ 2. listen to music _______ 3. in the park ________ 4. play chess ____ the tree___ 6. drink soybean milk _______ 7. do taij