Cross the road carefully, _________ you’llkeep yourself safe.

Li Na returned to Wuhan after the Games,________, as is known to us, she had been brought up and trained to be a gold medalist of tennis[ ]

I’m glad to say that she’salready finished 50% of the book in these days.

We ______ John’s name on the race list yesterday but for his injury.

Our maths teacher set so difficult an examination problem ______ none of us worked out.