Chia dạng đúng của từ trong ngoặc
1. I .................. ( study) for my English test when my mother ................ ( come) home from work.
2.I....................(read) a book when my sister ............... (leave) for the cinema
3. Emma ......................... (wash) the dishes when the telephone ...................... (ring)
5. I ...........................(write) an email when the lights ........ (go) out.