Usually children are allowed to ______ when they are six years old.

Tom is so worried about the test that he said he was going to study all night.—-Tell him he should quit _________and get some help.

great accomplishment rests on the of what came before it; when you trace it back, you’ll see one small step that started it all.

The first time for everything is always the most exciting one_____ it is your first day in a new job or going on a first date, you will always remember those “first” times.[ ]

I was so lucky that I met ______ European man on Three Gorges Square yesterday, and we had ______ happy conversation.