---Which of the following words has the same sound as the “s” in the word “cups”? ---Let me see. That’s .
-Please keep the secret _______me.-OK. I’ll keep it _______myself.
Why was the house on fire? _______ lightning hit it.
Please _________for my car.
He found _________important to protect wild birds.
The teacher asked us to keep quiet.Which kind of structures does the sentence belong to?