sweep away；light up；put up；come to an end；let off；tens of thousands of；upside down；scare...away；at war；up to
（1）The cafe owner has

put up

put up

the required "no smoking" sign.
（2）They must have known what their father was

up to

up to

．
（3）The fight between the two countries finally

came to an end

came to an end

．
（4）

Tens of thousands of

Tens of thousands of

men have travelled southwards to find work.
（5）The terrorists

let off

let off

a bomb near the building.
（6）He

swept away

swept away

the dust from the door.
（7）The country has been

at war

at war

with its neighbour for two years.
（8）Should I tell him how I feel，or would that

scare

scare

him

away

away

？
（9）If I were a lamp，it would be my duty to

light up

light up

thick darkness.
（10）If I stand on my head，I see everything

upside down

upside down

．