a) Complete with: scratch, bite, raise, frown, shrug, wink, cross, wrinkle, pull out, drum, purse, open.

Solution for part a)

Here are the completed phrases based on the images:

• mouth wide
• scratch head
• shrug one's shoulders
• bite fingers
• purse lips
• bite nails
• wink at someone
• cross arms and legs
• raise eyebrows
• frown
• pull out one's hair
• drum one's nose