Answer:
yeah sure
Explanation:
.....share your problem.....
this is a little hard but it seems to me that you have a wrong answer in number 2 you put ap over extremely but it should be over bird other than that you are good there is probably 1 or 2 mistakes so just go back over it i do not see anymore mistakes.
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!