Какие времена нужно использовать, помогите пожалуйста?
12. Andrea (to practice) the piano every day for six months before she (to enter) the competition. 13. The children (to be) sad because they (to lose) their dog. 14. We (not to have) a problem getting a table at The Tropicanabecause we (already to book) one in advance. 15. Mary (to wash) the dishes when a glass (to break) and (to cut) her finger.

12. Andrea (had been practicing) the piano every day for six months before she (entered) the competition. 13. The children (were) sad because they (had lost) their dog. 14. We (did not have) a problem getting a table at The Tropicana because we (had already  booked) one in advance. 15. Mary (was washing) the dishes when a glass ( broke) and ( cut) her finger.