Question

form a compound sentence.
_____________________________ ed should get an air mattress.
for their next camping trip, lillian and
before his next camping trip,
lillian should bring sleeping bags, or

Explanation:

To form a compound sentence, we need two independent clauses joined by a conjunction. The third option "Lillian should bring sleeping bags, or" can be combined with "Ed should get an air mattress" to form "Lillian should bring sleeping bags, or Ed should get an air mattress", which is a compound sentence with the conjunction "or". The first option is an incomplete clause, and the second is a dependent clause (adverbial phrase), so they can't form a compound sentence with the given clause.

Answer:

Lillian should bring sleeping bags, or