Heads from different countries gathered in Amsterdam and President Xi jinping _____ a speech on nuclear safety.

 The couple who were not _______ to each other ended up in divorce.

—Have you ________ him to keep good hours?  —Yes, I have. But he doesn’t listen to me.

— Why does he walk like that? It seems that he has great difficulty in walking.  — Because he got ____ in an accident three years ago.

 If traffic moves at low speeds, the number of accidents is       .