on，in，the，for，so，a，when，but，otherwise，before，under，to，including，though，by

（1）It all happened

so

so

quickly.
（2）I was sitting in my room with my cat，Smartie，

on

on

my lap，

when

when

the roof just flew off.
（3）All of

a

a

sudden，there was sky where the roof had been.
（4）Mom cried to get out quickly，

but

but

it was already too late by then.
（5）There was water everywhere，but we couldn't drink any of it

otherwise

otherwise

we'd get really sick.
（6）We just had drinking water that was sent to us

by

by

helicopter，but it was never enough.
（7）I just spent the days watching the boats going up and down the street and looking out

for

for

Smartie.
（8）He had disappeared

the

the

moment the storm hit.
（9）It was difficult to stay positive，

though

though

.
（10）We had lost our home and everything in it，

including

including

Smartie.
（11）It's a pity we didn't have time for a chat，but my next guest was waiting and we had to move

on

on

.
（12）In summer，we often sleep

under

under

the stars.
（13）It was several minutes

before

before

we realised what was happening.
（14）To get there

on

on

time，they started early.
（15）We have yet

to

to

decide what action to take.