The bad weather only ________ our difficulties．

A．added up

B．added up to

C．added

D．added to

Charles Babbage was generally considered ________ the first computer．

A．to invent

B．inventing

C．having invented

D．to have invented

I ________ for London tonight, for there is ________ an important meeting there．

A．am leaving; having

B．leave; to be

C．am going to leave; having

D．am leaving; to be

The driver of the yellow car ________　________ a white one came up very quickly．

A．has just starting; while

B．was just starting; when

C．is just starting; as

D．just started; since

The sky looks so gray, I think it ________．

A．is snowing

B．will snow

C．is going to snow

D．is to snow

She had to give a speech to 3000 people, but she proved quite equal ________ the situation．

A．to

B．with

C．in

D．on

We must do something to ________ factories ________ waste water into the river before it is cleaned．

A．stop; pouring．

B．prevent; to pour

C．keep; pouring

D．stop; to pour

Everybody in the little town knew my first teacher, so we had no ________ finding his home．

A．difficulties in

B．difficulty with

C．difficulty

D．difficulty to

People are puzzled(迷惑的)________ they read the book．

A．the first time

B．at the first time

C．for the first time

D．at first

There are ________ words in English that come from other languages．

A．a good many of

B．a great deal of

C．a great many

D．a large number