________ are searching for a tall dark man with a beard．

A．The policeman

B．The police

C．Some police

D．Police

Two weeks ________ enough for us to finish the work．

A．are

B．is

C．have

D．had

Since all ________ here, let's begin the meeting．

A．is

B．are

C．were

D．was

The professor and author ________ and will give a lecture in the stadium．

A．has come

B．have come

C．have reached

D．have arrived

I failed in the final examination last term and only then ________ the importance of studies．

A．I realized

B．I had realized

C．had I realized

D．did I realize

It was with great joy ________ he received the news that his lost daughter had been found．

A．because

B．which

C．since

D．that

Reading is an experience quite different from watching TV; there are pictures in your mind ________ instead of before your eyes．

A．to form

B．form

C．forming

D．having formed

Don't leave the water ________ while you brush your teeth．

A．run

B．running

C．being run

D．to run

War and Peace ________ the longest book I've ever read．

A．is

B．are

C．had been

D．have been

Three tins ________ enough to get me drunk．Pass me another．

A．aren't

B．weren't

C．isn't

D．wasn't