C-Fill in the blanks with the proper subordinating conjunctions to make the following sentences clear and coherent. 21. I used to sit alone and think about many things others played on the ground 22. I trusted him he is a trustworthy person 23. Alex and Sean became my best friends was already in college. 24. The alarm woke me up. it wasn't very loud. 25. Alex earned a big salary, he would not buy a new car​