I’ve been really busy with bits and pieces.
→ 이것저것바쁘네.
 ※  bits and pieces는 잡동사니, 작은 것들, 혹은 이것 저것 등등을 의미

[예문]
A: How have you been doing?
   어떡게지내?

B: I’ve been really busy with bits and pieces.
   뭐, 이것저것 바쁘네..

*  Can you tidy away all your bits and pieces before you go to bed?
 자러가기 전에 여기 니 잡동사니들 좀 치울래?