The first textbooks _________ for teaching English as a foreign language came out in the 16th century．

having written

to be written

being written

written

The _________ workers have been taken good care of by the government．

retiring

retired

to be retired

retires

Don’t use words, expressions, or phrases _________ only to people with specific knowledge．

being known

having been known

to be known

known

With much work _________, he had to put off his travel to the south．

dealt with

dealing with

to be dealt with

being dealt with

_________ our food _________, we had to walk to a village for help．

Since; runs our

Because; run out

With; running out

For; running out

_________ more and more trees and grass planted, Zhengzhou looks much more beautiful now．

Since

With

As

For

Only by practicing a few hours every day _________ be able to operate the new machine．

you can

can you

you will

will you

Having _________ pet to care for may give the elderly _________ sense of self-worth．

the; the

a; a

a; the

the; a

It’s said that driving after drinking _________ thousands of traffic accidents every year．

results from

contributes to

devotes to

lies in

As is known to all, fresh air _________ health．

contributes

contributes to

helps

affects