What color is it? ---It’s ________ orange. A. an B. a C. /
Helen encouraged me to speak English as much as possible because practice ___ perfect.
With the development of modern industry, there will be ___ living space for wild animals.
Audrey Hepburn, one of the greatest actresses, was ___ to take on challenges in her life.
--Wow, so many new buildings! But it used to be a poor village.--Yes, ___ has changed in our hometown.
Don't go out ___ the rain stops. Otherwise, you'll get wet!