Correct

空当儿

/ kòngdāngr /
Strokes

Example

As a Noun

space; gap

1
Chōuti
抽屉
mǎn
le
  
,
méiyǒu
没有
kòngdāngr  
空当儿
fàng
zhè
běn
shū
  

The drawer is full; there's no extra space for this book.

As a Noun

interval; break

2
yòng
利用
jiān
课间
de
kòngdāngr  
空当儿
le
diànhuà
电话
  

I made use of the class interval for a phone call.

3
Chèn
zhè
kòngdāngr  
空当儿
  
,
fēng
xìn
  

I'll go and post a letter during the break.