... Teacher :Quynh Nhu Practice test Combine the following sentences by changing the second sentence into a relative clause 1. I remember the day. I was afraid ... supply b. survival c. influence d. interference 11. Tropical forests have supplied us with many sorts of plants for food, medicine, and industry. a. affected b. influenced c. changed d. provided ... or in a particular place. a. extinct b. rare c. survival d. productive 9. Those who concern are very worried about the _____ of many species. a. disappearance b. establishment c. supply d....