1 . Hundreds of thousands of volunteers are working hard to deal with the environmental pollution, change the world and make it a better place to live ________. (用适当的词填空)

2 . The radio signal was sent out ________ a special way so that no one was able to jam it. (用适当的词填空)

3 . The baby is sleeping, so you’d better speak ________a whisper. （用适当的词填空）

4 . They did not have enough staff, and the laboratory ________ which they worked had poor air quality. (用适当的词填空)

5 . Hotels sell service rather than products, or to put it ________ another way, service is their product.(用适当的词填空)

6 . To my surprise, he is a graduate _________ medicine. (用适当的词填空)

7 . Don’t be nervous; please view it ______ a positive light. (用适当的词填空)

9 . I have no hesitation ________ recommending her for the job. （用适当的词填空）

10 . How could you fail ________ such an easy test? (用适当的词填空)