It is often________that human beings are naturally equipped to speak.

It is the second time that I ____ in Shanghai. What great changes! It’s years since I ____ here last time.

 ______ what your families said just now, I think, and you will make your own decision.

—Why don’t you take some exercise? Sitting before the computer is bad for your health. ---________, but I have to finish my work on time.

. My first summer vocation in the high school, _______I spent a fortnight on the farm, is really unforgettable.