阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。
Hiding 1 the loose dusty curtain, a/an2 packed up his overcoat into the suitcase. He planned to leave home at dusk 3 there was thunder and lightning outdoors. He had got to do this because he was tired of his 4 nagging about his 5 study and did not want to 6 it any longer. He couldn't get along 7 with English and disliked joining in English classes because he thought his teacher ignored him 8 purpose.9 , his score in each exam never10 over 60.
His partner was 11 about him very much. She understood exactly12 he was suffering from, but 13 disagreed with his idea.14 calm him down and settle his problem, she talked with him face to face and 15 a series of learning tips with him. The items she set16 helped him find the17 to study English well. The teenager was grateful and got great 18 from his friend's words.
Now, he has recovered from being 19 and has fallen in love with English. What an important part friends 20 in our life!
