Unfortunately, I don't see a word in bold. I'd love to help, but I need the word.
1. The correct answer is C, After they cleaned their rooms, the boys planned to go swimming, but it started to rain. Because a compound-complex sentence contains two independent clauses and at least one dependent.
2.C is the correct answer, 'while I was reading last night' is the dependent clause.
Well to endure something means deal with it for an extended period of time so it probably means to run out of stamina and not be able to endure anymore