These articles are written in simple language, ________ makes it easy to read．

that

this

which

it

The poor man, ________, ran out of the dark cave．

tiring and frightened

tired and frightened

tired and frightening

tiring and frightening

The stone bridge ________ last year is very beautiful．

built

was built

being built

to be built

Not until the early years of the 19th century ________ what heat was．

man did know

did man knew

didn't man know

did man know

Tom kept quiet about the accident ________ lose his job．

so not as to

so as not to

so as to not

not so as to

We must work hard to ________ a good knowledge of English．

take

acquire

catch

hold

A driver should ________ the road when ________．

concentrate on; drive

concentrate in; driving

concentrate to; drove

concentrate on; driving

________ in a friendly way, their quarrel came to an end．

Being settled

Settled

Settling

Having settled

His report was so exciting that it was ________ interrupted by applause(掌声)．

constantly

constant

seldom

never

He asked us to ________ him ________ carrying through their plan．

assist; with

help; to

assist; in

help; with