giúp mình vs ạ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

EXERCISE A. Choose the best answer: 1. I was studying the light went out. (when/while) 2. The boys were playing soccer the girls were skipping(when/while) 3. My sister the chores now. (is doing/ was/doing) 4. Tom handing in his notebooks on time. (is always forgetting/ was always forge ...