______ there was no conclusive evidence, most people thought he was guilty.

—The contest is so easy, but you fail to pass it．
—I’m sorry it ______ be this way．

--Pity you missed the lecture on nuclear pollution.
-- I ___ it, but I was busy preparing for a job interview.

It ___ be the postman at the door. It’s only six o’clock.

— Mum, would you please buy me an MP5 player?
— If you can help do some housework the whole vacation, you ____ have one as a reward.     

Generally speaking, my grandmother is nice and kind, but she _______ be very
stubborn at times.

But for the heavy traffic, the police ___ the thieves who tried to escape in the stolen car.

Determined to devote himself to those poor children, he chose to teach in a western province, though he _______ in the city for a better life．
A could stay        B would have stayed C could have stayed D had stayed

He commanded that all the gates      ．

So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.