Must be

(phrase) how a child acts (at age 3) already determines how he / she will be when he / she is an adult.

to make a decision / place an order / place a deposit

Kyoto Protocol

Stand still

halt to a stop

ceasefire agreement

to refer somebody cannot settle down, or pay attention to things

not necessarily ;not sure

always active or running around

Law of reflection

Gentleman's agreement

not absolutely

literal meaning / translation: unsure / unstable; this term is seldom used alone, it is always used with another adjective to form a proper term, to loosely imply something that is 'not set' or 'not fixed' in any particular way

cannot sit still

sit tight

an idiom to describe a person's feeling of confidence regarding the result or outcome of a matter / event

don't know to cry or to laugh

(conjunction) or

the ability to resist temptation

calm down and do it slowly and steadily

must

space, place

the shape or form of something or the characteristic of someone is fixed and can't be changed or altered anymore; frozen in place

to be so scared that one freezes; to space out

to make plans

(adjective) to be calm and confident; to be composed; to be cool as a cucumber

to calm down from being too scared

Law of inertia

prepared for losing