Ⅰ. Complete the sentences with that, if or whether.

Opinions about nature exploration
1. Lucy isn't sure the ocean is deeper than we imagine.
2. Tony asks there are unknown plants in the rainforest.
3. He is not sure there is a real UFOin the universe or not.
4. We think exploring nature helps us know the world better.
5. Mr Chen tells us astronauts have arrived at Mars to explore
space.

Ⅰ. 1. if/whether 2. if/whether 3. whether 4. that 5. that

Ⅱ. Complete the sentences by turning the direct speech into correct objective clauses.
1. "I will explore the deep sea someday. " Mike says.
→ Mike says .
2. "Dinosaurs lived on earth millions of years ago. " Lily believed.
→ Lily believed .
3. "Can plants talk to each other quietly? " The little boy wondered.
→ The little boy wondered .
4. "Is he a guide in the science museum?" Amy asked Mike.
→ Amy asked Mike .

Ⅱ. 1. (that) he will explore the deep sea someday
2. (that) dinosaurs (had) lived on earth millions of years ago
3. if/whether plants could talk to each other quietly
4. if/whether he was a guide in the science museum

Ⅲ. Complete the passage with proper words according to the Chinese given.
Our school is holding a Nature Exploration Show in Natural Science Week.
We want students to write about new nature discoveries.
Here is information on the school message board.

MESSAGE BOARD
+ All messages
Let's explore the secrets of 1. 鲸鱼—the huge and lovely stars on the
blue 2. 行星!
① Scientific 3. 发现 tell us blue whales are Earth's biggest animals. What's one
kind of amazing fact do you know?
② Whales make special sounds and people call them "songs". Do you have ideas what these
sounds are for?
③ We use different research 4. 方法 to study them, but some parts of their lives
are still unknown. What do you think of them?
Later, please 5. 上传 a short note about your favorite whale fact!

Ⅲ. 1. whales 2. planet 3. discoveries 4. methods/ways 5. upload