Complete the sentences with two to five words, including the word in bold. 1 I've never heard of such an amazing discovery. This is . the I've ever heard of. 2 They ran out of money; that's why they didn't complete the research. would If they hadn't run out of money, the research. 3 Earth is warmer than Mars. Mars as Earth. 4 Stephen Hawking is the best scientist of all. than Stephen Hawking anyone else. Tregret not studying harder for my science test. only If harder for my science test. Rosie's experiment was easier than Mark's. less Rosie's experiment Mark's. 7 It's a pity I cannot attend the Science Festival tomorrow. only If Science Festival tomorrow.​

1. This is the most amazing discovery I've ever heard of.
Explanation: The sentence is comparing the current discovery to all other discoveries the person has heard of. The word "most" emphasizes that it is the most amazing discovery.

2. If they hadn't run out of money, the research would have been completed.
Explanation: The sentence is expressing a hypothetical situation in the past. It is stating that if they hadn't run out of money, the research would have been completed. The word "would" indicates the hypothetical outcome.

3. Mars is not as warm as Earth.
Explanation: The sentence is comparing the temperature of Earth and Mars. It is stating that Earth is warmer than Mars. The phrase "not as" indicates a comparison between the two.

4. Stephen Hawking is better than anyone else.
Explanation: The sentence is comparing Stephen Hawking to all other scientists. It is stating that he is the best scientist compared to anyone else. The word "better" indicates the comparison.

5. I regret not studying harder for my science test.
Explanation: The sentence is expressing a feeling of regret for not studying harder for a science test. The word "regret" indicates the feeling of disappointment or remorse.

6. Rosie's experiment was less difficult than Mark's.
Explanation: The sentence is comparing the level of difficulty between Rosie's and Mark's experiments. It is stating that Rosie's experiment was easier than Mark's. The word "less" indicates the comparison.

7. If only I could attend the Science Festival tomorrow.
Explanation: The sentence expresses a desire or wish to attend the Science Festival but recognizes the impossibility. The phrase "if only" indicates a strong desire or wish. It is stating that the person cannot attend the Science Festival tomorrow.