HSK V7-9
Correct

火速

/ huǒsù / 
Strokes

Definition

at top speed/at a tremendous lick

Example

As an Adverb
at top speed; posthaste
1
Rènwu
任务
shí
十
fēn
分
jǐnjí
紧急
  
,
bìxū
必须
huǒsù
火速
wánchéng
完成
  
。

It's an urgent task and must be accomplished at once.

2
Dàpī
大批
yīwù
医务
rényuán
人员
huǒsù
火速
gǎnfù
赶赴
chūshì
出事
dìdiǎn
地点
  
。

Large numbers of medical workers hurried to the spot of the accident.

3
Huǒsù
火速
zēngyuán
增援

rush up reinforcement

4
Huǒsù
火速
sòngdá
送达

deliver immediately

5
Huǒsù
火速
huí
回
diàn
电

cable reply immediately