Jack, one of my buddies, kept ___________ (nod) his head as if he completely understood what I said.
Years ago we didn't know this， but recent science ______________ (show)that people who don't sleep well will soon get ill.
He with his friends ____________ (lie) in the sun and feeling relaxed on the Long Beach when his new boss called him.
We first met on a train in 2000. We both felt immediately that we ___________ (know)each other for years.
Listen to the speaker carefully, or you _____________ (miss) something important .
— The food here is nice enough. 
— Yes,my friend _______________ (introduce) me a right place.
Jack told me that they ______________ (return)to the USA from Shanghai by the end of next November.
To prevent the things getting worse, action should _______________ (take) at once.