David rode so fast that he couldn’t hitting a passer-by and he fell off the bike.
I have been living in the United States for twenty years, but seldom _____ so lonely as now.
In the study of modern science, there are many cases _____ soldiers can teach officers.
— Why didn’t they complete the task in time?— Because it was not until late afternoon _____ they began to solve the major problem.
Your story is perfect; I’ve never heard _____ before.
We have a wide selection of sweaters that will appeal _____ all ages, and in particular the teenager market.