To combine these sentences together to flow neatly and be grammatically correct you could say: Early airships such as zeppelins were filled with hydrogen, but today's blimps use helium instead. This is the correct answer out of your choices.
Your answer is: Early airships such as zeppelins were filled with hydrogen, but today's blimps use helium instead.
Have an amazing day and stay hopeful!
Answer:
because sometimes they tell us things that we didn't know things that are in the past but just when the stories are real.
They sought to severely limit colonial trading and colonial production that competed with the English manufacturers.<span />
False, whom is another form of who. The writer should use which for an object.
