Помогите вставить артикли the, a/an, либо нулевой артикль l) ...island was

Помогите воткнуть артикли the, a/an, либо нулевой артикль
l) ...island was rather small but breathtakingly beautiful. 2)... elephant is a remarkably strong animal. 3) There was ... huge castle in front of them. 4) I can't open ...door. I've lost my key 5) ...painting you have given her as a gift is really awesome. 6) What ...wonderfully peaceful valleys there are! 7) ...right answer is: "Yes!". 8) We always stay at five-star hotels when we go to ...sea. 9) Sun is not... planet, it is ...star. 10) It is...unforgettably picturesque place.