HSK V6
Correct

只管

/ zhǐguǎn / 
Strokes

Definition

solely engrossed in one thing/just (one thing, no need to worry about the rest)/simply/by all means/please feel free/do not hesitate (to ask for sth)

Example

As an Adverb

by all means

1
Nǐ
你
yǒu
有
shénme
什么
shì
事
  
,
zhǐguǎn
只管
gěi
给
wǒ
我
xiěxìn
写信
  
。

If there's anything I can do for you, don't hesitate to write to me.

As an Adverb

simply; just

2
Tā
他
bùhuì
不会
shǐ
使
jiǎng
桨
  
,
xiǎochuán
小船
zhǐguǎn
只管
zài
在
húzhōng
湖中
dǎzhuàn
打转
  
。

Because he couldn't use the oars, his boat just turned round and round on the lake.