Both students and parents appreciate the great importance schools have ________ to eyesight protection．

reacted

attached

attended

adapted

In the school, some fans even don’t know the ________ of jazz．

origin

original

discovery

resource

The job ________ to be harder than we thought．It took us two more days to finish it．

turned over

turned out

turned up

turned off

Experts agree that everyone needs vitamins ________ our bodies can operate normally．

so that

even though

as if

as long as

The play ________ next month aims mainly to show the local culture．

produced

being produced

to be produced

having been produced

The hospital is ________ signs telling patients that it can offer only limited services．

holding up

putting up

building up

going up

You really need to go out and get some fresh air and sunshine．You ________ overworked during the last two weeks．

have been

were

had been

would

Silk from China found its way to India, the Middle East and Rome, ________ spices and glass, which was not known to China．

in exchange for

in return

in change for

in need of

Li Yang, the founder of Crazy English, says that he copies it down ________ he comes to a sentence．

unless

while

because

every time

This is the third time I ________ Beijing．The second time I ________ here was on Christmas Day last year．

have visited; came

have visited; have come

visited; came

visited; have come