Some insects_____ the colour of their surroundings (环境) to protect themselves.
Within industries,companies are always trying to develop products that are one step better than _____ of other companies.
— How many classmates did you see there?— ________.
—Daddy, which of those smart hats do you like in the hat shop?— _______. They are both expensive and less warm-keeping.
From the chart we can learn that the max temperature in Auckland is nearly 30C higher than ______ in Wellington.
New ideas sometimes have to wait for years before _____ .