Studies show that people are more _________ to suffer from back problems if they always sit before computer screens for long hours．

likely

possible

probable

sure

The first use of atomic weapons was in 1945 and their power _________ increased enormously ever since．

is

was

has been

had been

It is _________ the trouble to explain a job fully to new employees．

worthwhile taking

worthy taking

worthy of take

worth to take

The teacher together with the students _________ discussing Reading Skills that _________ newly published in America．

are; were

is; were

are; was

is; was

He suddenly saw Clara _________ the room．He pushed his way _________ the crowd of people to get to her．

across; across

across; through

over; into

over; through

The traffic rules say young children under the age of four and _________ less than 40 pounds must be in a child safety seat．

being weighed

to weigh

weighed

weighing

If you have a job, _________ yourself to it and finally you'll succeed．

do devote

don't devote

devoting

not devoting

Sorry, I’m late, but you cannot imagine _________ great trouble I had trying to find your house．

how

however

whatever

what

She was _________ by the heat and fell to the ground, unconscious．

astonished

depressed

overcome

hit

On hearing the news that his father had returned from abroad, Jack got up quickly, _________ the breakfast _________．

left; unfinishing

leaving; unfinished

left; unfinished

leaving; unfinishing