What do you think of zoology? —- In my opinion, zoology is ______ botany.

He stayed at home_____climbing the mountain ____the rain.[ ]

Such good use has been____ his spare time_____ his English has improved a lot.

Linda likes playing ______ sports, but she dislikes playing ______ guitar.

I’d like to help ________ /’h?uml?s/ people.