with，because，from，the，if，a，of，to，during

（1）However，new research suggests that the story may be fiction instead

of

of

fact.
（2）The well-known story is that the American Founding Father and scientist flew a kite

during

during

a storm in 1752.
（3）He raised the kite with

a

a

piece of string tied to it.
（4）More than one generation of schoolchildren has been amazed by his bravery and his scientific approach

to

to

looking for the truth.
（5）Franklin，along

with

with

many other scientists，has inspired us and taught us that scientific experiments are important in order to establish

the

the

truth and to contribute towards later scientific discoveries and inventions.
（6）But scientists all agree that if Franklin had actually touched the key，he would certainly have died

from

from

the electric shock.
（7）Scientists often question accepted ideas

because

because

they want to establish the facts.
（8）Some have even questioned the story about the apple that fell on Newton's head and led him to come up

with

with

his theory of gravity.
（9）In fact，more than one account suggests that while Newton was certainly inspired by a falling apple，there is no proof that it hit him on

the

the

head.
（10）We should not always believe everything we read or hear - even

if

if

it is a great story.
（11）He slept calmly

during

during

the early part of the night.
（12）She went

from

from

house to house asking if anyone had seen the child.
（13）Taste the soup and add salt and pepper

if

if

necessary.
（14）In summer Venice is crammed

with

with

tourists.
（15）We arrived in England on

a

a

cold wet Sunday in 1963.