Limited natural resources should be made full use of _______ the _______ need of energy.
— Do you think he can pass the exam? —____________, because he has spent too much time playing computer games.
After ten years of hard work, they at last got _________.
—Would you like some more chicken? —No, thanks. I’m ___ a diet and try to ___ weight.
________of both sides, the two companies decided to _______ to become more competitive in the global market.
The letter reminded me _______ the good time we had spent together.