根据下列句子及所给汉语注释，在句子右边的横线上，写出空缺处各单词的正确形式。（每空只写一词）

⑴I am pleased that he gladly      （接受） our invitation. .     

⑵A soldier's duty is to      （服从） orders.      .     

⑶Some people work better under      （压力）.            

⑷ I changed into my sports shoes so that I could walk more      （舒服）.     

⑸The patient kept      （咳嗽） all night.               

⑹ We've got to be       （实际） and buy only what we need.     

⑺ The artist held an      （展览） of his works last month. .     

⑻We gave our classroom a      （彻底）cleaning before the National Day.     

⑼ Parents should help their children to form good        （习惯）.     

⑽All the boys were standing up         （笔直）.