If nothing________,the oceans will turn into fish deserts. (2013·湖南,26)
_____ with so much trouble, we failed to complete the task on time
It’s reported that the United States uses______ energy as the whole of Europe.
The rare fish,_____ from the cooking pot, has been returned to the sea.
----- I’m taking my driving test tomorrow. ----- _____!
Some insects_____ the colour of their surroundings (环境) to protect themselves.