—What a mistake!—Yes. I________his doing it another way, but without 　success.

I ___________ in the street when I met an old friend of mine  yesterday.

The scientists predict that if present trends____, women in 400 years will be 2cm shorter and have healthier hearts．

—Mary, do you still remember the first time we met?—of course, You         Helen’s birthday party with your friends in a restaurant.

E-mail , as well as cellphones, _____an important part in daily communication.