1 . Still, practical problems remain __________ (solve), such as ensuring the trips are safe as many taxis will be flown without pilots. (所给词的适当形式填空)

2 . When daylight broke, I felt extremely relaxed and _______________ (relief), as if I were a child with a heart filled with thankfulness. (所给词的适当形式填空)

3 . During a study of children, it was shown that if children are exposed to three or more years of musical training, they had better listening and speaking skills than ________ who had none. (用适当的词填空)

4 . Goals help students focus on their journey to a collection of achievements, meaning they make ________ most of their resources and time and can have motivation(动力)during times when they may feel like giving up. (用适当的词填空)

5 . She received many gifts for her birthday, all of ______ are thoughtful and well-chosen.(用适当的词填空)

6 . When a scientist doesn’t know the answer to a problem, he is ________ (ignore). When he has an idea as to what the result is, he is uncertain. And when he is pretty sure of what the result is going to be, he is still in some doubt. (所给词的适当形式填空)

7 . The fact that you stay up late to prepare for dictations does make a difference ________ chasing your dreams. But it is important that you learn to take advantage of time segments. (用适当的词填空)

8 . Additionally, I will have more opportunities to meet people from all walks of life, which is both________ (challenge) and interesting. （所给词的适当形式填空）

9 . Human activities have influenced animals both directly and indirectly, putting them in extreme danger; as a result, they are nowhere______(find). (所给词的适当形式填空)

10 . He lacks organization when expressing his perspectives, ______ he has extraordinarily high intelligence and often comes up with creative ideas.(用适当的词填空)