_____ is slower than riding a bicycle

 _____ to and from companies is very tiring.

She whistles while she is _____.

I'd rather be _____ in the park than working right now.

 He whistles while he is _____

When _____ under stress, walking around the office helps me to relax.

 I've been  _____ non-stop for the past week. 

 _____ to the company is good exercise.

 I've been ______ for a long time, so I'm really tired.

I'm _____ on this project everyday now.