4. Choose the correct word. 1. Don't eat/bite your nails. 2. Smiling shows/points you are friendly. 3. Showing/Playing with your hands suggests you are nervous. 4. I don't know Bill well enough to form/make an opinion. 5. When you are talking to someone, make eye impression/contact with them.

Don't bite your nails.
Bite your nails — устойчивое выражение: «грызть ногти».

Smiling shows you are friendly.
Shows означает «показывает, демонстрирует». Улыбка показывает, что человек дружелюбен.

Playing with your hands suggests you are nervous.
Playing with your hands — теребить, беспокойно двигать руками. Это может указывать на нервозность.

I don't know Bill well enough to form an opinion.
Form an opinion — составить, сформировать мнение о ком-то.

When you are talking to someone, make eye contact with them.
Make eye contact — поддерживать зрительный контакт.