Onethird of the area__________covered with green trees.About seventy percent of the trees__________been planted.
Thank you for your help, ________ I couldn’t passed the exam.
Do you know the name of the road that _______ now ?
I would __________ it if you could do me a favor.
---Winning the bid to host the Olympic Games means not only a great honor to a nation_______.
There is no doubt _______ first aid(急救) is only a temporary form of help given to a patient.