I’ll give the prize to _______ finishes the work first.
About an hour after sunrise, I rode across the countryside——birds were singing.
It was very dark, ____Jane seemed to know which way take at the crossroads.
---How did you find your visit to the Summer Palace yesterday?---______. I got separated from my 80-year-old grandparents.
______ in his novel, he didn’t notice his teacher entered the classroom.
It took me quite a while to ______ how to solve this problem.