Choose the sentence that is closest in meaning to the original sentence in each of the following question

Choose the sentence that is closest in meaning to the original sentence in each of the following question
35. They are not sure how they should operate the new system.
A. They are not sure how should to operate the new system
B. They are not sure how to operate the new system.
C. They are not sure why should to operate the new system
D. They are not sure what should to operate the new system
36. "Don't leave your luggage unattended", he said.
A. He asked me not to leave my luggage unattended.
B. He asked me to not leave my luggage unattended.
C. He asked me not leave my luggage unattended.
D. He asked me not leaving my luggage unattended.
37. He felt very miserable, so he looked for someone to share his life with.
A. He looked for someone to share his life with although he felt very miserable.
B. Although he looked for someone to share his life with, he felt very miserable.
C. Because he looked for someone to share his life with because he felt very miserable.
D. He looked for someone to share his life with because he felt very miserable.