请根据句子意思，选用适当词或用所给词的适当形式填空。 11. 小题1:Because of the lack of the ______ （motivate）to study, he failed to pass the final exams. 12. 小题2:The patient was quite beyond the possibility of ______（recover）. 13. 小题3:Only by ______（acquire）a good knowledge of English can you do international business successfully. 14.小题4: Diamond necklaces and rings had been ______ (beauty) arranged on a background of black velvet. 15. 小题5:However, I lost sight of Wang Ping when we reached ______ looked like a large market. 16. 小题6:______ rushed a tiger from among the bushes. As a result, a tourist was scared to death. 17. 小题7:Unless ______(change), this law will make life difficult for farmers. 18.小题8:In China, especially in Shanghai, there was a time ______ many senior students wanted to study abroad. 19. 小题9:Believe it or not, there is no such thing ______ standard English. 20. 小题10:--- I saw no more than one motor car in that shop. Will you go and buy it? --- No, I’d rather find ______ in other shops.