I have no idea how it ________ that the man met with trouble again．

came out

came about

came up

came across

________, I think, and the problem could be settled．

Making great efforts

So long as you keep up your spirits

If you double your efforts

A bit more effort

The research mainly deals with the difficulty the students have ________ their attention on their study all the time．

to focus

to be focused

focusing

focused

________ modern science and technology, people lead a more and more comfortable and rich life．

According to

In addition to

Thanks to

Instead of

Mark promised me that he would tell Frank my message ________ he met him when he returned to school．

now that

the moment

in case

even if

It’s over twenty years ________ we met last．Can we recognize each other when we meet at the airport?

before

until

since

once

The city, ________ in the north of Shanxi, has a history of more than 1400 years．

located

to be located

being located

locating

________ is often the case with children, Tom was completely better by the doctor arrived．

That

What

How

As

A great number of farmers ________ become workers or businessmen, so the number of farmers working in the field ________ decreasing．

have; is

has; are

have; are

has; is

The company ________ it’s financial losses on the depressed economy, not on its bad management．

blamed

accused

excused

reminded