Exercise 1. In this part there are 10 sentences. In each sentence there is a blank. Please fill in the blanks with the words given. Each word can only be used once and there are some extra items that won't be chosen.
According to a __________ of 1,000 city residents, garbage collection is the city service people like most.
A、storage
B、observed
C、survey
D、cover
E、obstacle
F、celebrity
G、exclusive