My brother usually /ask me for help /when he /has difficulty with his /homework.

Animals like frogs #have waterproof skin #that prevents #it from drying out quickly in air, sun, or #wind.

• A. snorkelling
• B. sensitive
• C. diversity
• D. reserve

All types of dinosaurs went extinct long time ago.

• A. thrived
• B. boomed
• C. survived
• D. died out

More complex animals gradually evolved from these very simple creatures.

• A. resolved
• B. involved
• C. revolted
• D. developed

Many birds didn't survive the severe winter.

• A. have enough food
• B. surprise
• C. get over
• D. continue to live

Do you realize that by this time next week we have been in Paris?

 Rare animal extinction is one of the ______ things that could have happened.

• A. good
• B. best
• C. worse
• D. worst

Living in a big city isn't ____ interesting as I thought it would be.

• A. less
• B. most
• C. more
• D. as

 We need to do this ____ than we are at the moment.

• A. quickly
• B. the quickest
• C. more quickly
• D. most quickly