—Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?—No, but scientists are working to develop ________ .
The boy is so afraid of snakes that when he saw a small one yesterday on his way home he burst _______ crying.
He’s from Shanghai, ________ population is the largest of all cities in China.
Li Hua has succeeded in the entrance examination and his dream ______ being a university student will ______.
— Excuse me, what's the time for Train 8201? — It _____ at seven and you can wait in the hall.
_____ students are practicing _____ English with each other at the English corner.