Once telling him the truth, ________．

he will be nervous all the time

he will find himself nervous all the time

you will find him nervous all the time

everyone will find him nervous

________ I really don’t like art, I find his work impressive．

As

Since

If

While

Some pre-school children go to a day care center, ________ they learn simple games and songs．

then

there

while

where

The book was written in 1946, ________ the education system has witnessed great changes．

when

during which

since then

since when

________ the safety of gas, the government has checked the city’s gas supply system thoroughly．

To ensure

Ensuring

Having ensured

To have ensured

When asked why he went there, he said he was sent there ________ for a space flight．

training

being trained

to have trained

to be trained

The children talked so loudly at dinner table that I had to struggle ________．

to be heard

to have heard

hearing

being heard

The flowers his friend gave him will die unless ________ every day．

water

watering

watered

to water

People try to avoid public transportation delays by using their own cars, and this ________ creates further problems．

in short

in case

in doubt

in turn

The computer system ________ suddenly while he was searching for information on the Internet．

broke out

broke down

broke up

broke in