Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects our brains, making us feel happy.
Medical doctors sometimes can make mistakes ______ will cost ______
Many people have applied for a job with our company, but we only have one or two ______ positions at the moment.
We would not ______ such hard work. It’s impossible for us to complete in such a short time.
______ is no doubt that children ______ more easily to new environments than adults.
The climate here is always hot, summer and winter ______.