Correct

想必

/ xiǎngbì /
Strokes

Definition

presumably/probably/in all likelihood/surely

Example

As an Adverb

presumably; most probably/likely

1
Xiǎng
想必
yánzhòng
严重
  

It's most probably nothing serious.

2
Xiǎng
想必
tīngdào
听到
zhège
这个
xiāoxi
消息
le
  
?

Presumably you've heard the news?

3
Xiǎng
想必
如此
  

I presume so.