1 . The excessive use of high technology can also make our life passive, which will make the majority of us become lazier, and we are unwilling ________ (explore) minds any longer. (所给词的适当形式填空)

2 . At present, there are some weak links in the related domestic research. And some key problems still remain ____________ (explore). (所给词的适当形式填空)

3 . In closing, astronauts must have a determined will and a strong desire___________(explore) the universe. (所给词的适当形式填空)

4 . The boy is keen________（explore）the mysteries of the solar system, even the universe. (所给词的适当形式填空)

6 . This is the golden opportunity ________ (explore) the custom to celebrate the Lantern Festival. (所给词的适当形式填空)

7 . According to Paragraph 2, compared with adults, children are more eager ________ (explore) the world around them. (所给词的适当形式填空)

8 . The thought of the terrible scene ________ (frighten) me, so I ran away quickly before ________ (explore) the dark forest. (所给词的适当形式填空)

9 . Philosophers and educators have devoted a good deal of time to ______ (explore) its meaning. (所给词的适当形式填空)