简答题 Restaurants may be closed down if they fail to keep up to minimum standards of ______ .

简答题 It is ______ that all the applicants should be computer-literate for this job.

简答题 It was such a hot night that he had a cold shower to ______ himself.

简答题 He hated to think of her in so much pain and covered his ears to hide her ______ .

简答题 Sulphur dioxide is a pollutant and a major______ to acid rain.

简答题 He was _____ from his sleep at some dark hour by his mother begging him to go downstairs to help her.

简答题 These experiments show ______ the connection between smoking and cancer.

简答题 Ginseng (人参) has been used for over 4,000 years in the Orient as a ______ and preventive remedy.