1 . But in cities, limited space has led to people _________ (look) for new solutions. （所给词的适当形式填空）

2 . The detox was more difficult ________ (tolerate) than I had expected. But on reflection, I can see how much of my time ________ (occupy) with checking my phone. (所给词的适当形式填空)

3 . _________ is easier than to do.

A．To say

B．Saying

C．To be saying

D．Being said

4 . Many people are suffering _____(economy) hardship. (所给词的适当形式填空)

5 . Much to their delight, their new project __________ (approve) at the conference, the excited scholars decided to hays a barbecue to celebrate the fantastic moment. (所给词的适当形式填空)

6 . In addition, the more you work out, the___________(energy) you will become. (所给词的适当形式填空)

7 . After knocking politely at the door, that ________ (apply) entered the office of the editor. (所给词的适当形式填空)

8 . Most information was collected by direct ________(observe) of the animals’ behaviour. (用所给词的适当形式填空)

9 . He spent much of his life ________ (探索) the wildlife. （根据汉语提示单词拼写）