This ruler is _______ than that one.

Some people haven’t realized something as common as _______to the sun for a longtime will do harm to their skin and even cause skin cancer

How much difficulty has the team had_______ this problem—_______．The members are all good problem solvers.

Premier Zhou Enlai for many years， he still lives in the hearts of Chinese people.

These natural parks are important for preserving animals, which would ________ risk dying out