1 . I find ________ necessary to do everything we can ________ protect the environment.

A．it; do

B．this is; do to

C．it; to

D．it; in order that

2 . 阅读下面短文，在空白处填入 1个适当的单词或括号单词的正确形式。

The Wandering Earth is a Chinese science fiction movie,     1     is based on the novel of     2     same name by Liu Cixin, and was released on February 5, 2019, the Chinese New Year’s Day.

After learning the sun is dying out, people all around the world feel     3     (frighten),

so they build giant planet thrusters (星球推进器)     4     ( move ) the earth out of its orbit and sail     5     to a new star system. The 2500 years’ journey comes with unexpected dangers, but in order to save humanity, a group of young people come out bravely and fight hard for everyone’s     6     (survive).

We     7     (impress) to see the theme of this film. It doesn’t particularly show somebody’s ability to save our world     8     shows all the human beings are working together,     9     (spare) no effort to save this world.

The Wandering Earth is seen by people as the dawn(开端) of Chinese science fiction movies. It means that China’s sci-fi movies have     10     (official) set sail.

3 . I regret ______ that I’m too busy ______ in the talk.

A．to say, to participate	B．saying, participating
C．to say, participating	D．saying, to participate

4 . ________ (produce) 500g of honey, a single bee would have to make about 10 million trips from the hive to the flower and back again.

5 . It requires my great efforts ______   ________ (澄清)what I mean.