________when we had to be at the mercy of the weather．

Going are the days

Gone are the days

Are gone the days

Gone the days are

Nowadays, few people develop the habit of keeping a supply of oil－lamps in the house in case of power ________．

lack

absence

failure

drop

Recently, there is ________ boom(繁荣)in population mobility and according to ________ national population survey of 2004, 17 percent of the population move every year．

the; a

a; the

/; a

the;/

The policewoman came to the spot ________ she heard of the accident．

in an instant

the instant

for and instant

instant

Mom started early in the morning, so I guess it ________ be long before she phones me about her arrival．

wasn't

isn't

won't

hasn't been

It is commonly believed that it is ________ too much money has been invested in real estate(房地产)________ has caused the crisis in Wall Street．

that; that

that; which

what; that

because; that

Understanding the cultural habits of another country, especially ________ containing many different subcultures like the USA, is a difficult thing．

which

that

one

those

Bolt ran 100m at 9.58 seconds at the World Athletics Championship in Berlin, and broke his own record, ________ at the 2008 Beijing Olympics．

to set

setting

set

having set

The boss ________ department Ms Li worked ten years ago looks down upon women．

in which

in that

in whose

whose

Thank you for the great difficulty you have had ________ me with my designing work．

helping

to help

with helping

to have helped