People think that ______ opening ceremony of the 29th Olympic Games is _____ great success.
--- Let’s have a rest. --- Not now. I don’t want to stop _________ now.
--- You did very well at the meeting, Black. --- Well, I regret ___________ that to the boss.
--- What do you suppose made her worried?--- _________ a new cell phone.
One third of our school _________ covered by trees, while the majority of our students ________ girls.
People in China don’t like hugging each other when meeting, which _________ a common __________ in some European countries.