—Can you describe ___ it happened?—Yes, I was riding on my bike ___ a car knocked me down from behind.
She dislikes ________in public places.
I'm very tired ________walking for two hours.
It is Tu Youyou ________was presented the 2011 Lasker Clinical Medical Research Award on September 12.
We can ________a note of what the teacher says in class and ________notes afterwards.
All the employees of this department were ________into groups to discuss the question.