(1) I looked up at him to ask him to untwine his arms.(2) Hydrogen bonds are the perfect strength to hold DNA together under most situations, but are weak enough to form and break readily to enable DNA to untwine for replication.(3) He set me down gently on my bed and untwined my arms from around his neck.(4) Only then could I reach the tangle, which I simply untwined before sliding down the rope to the deck.(5) She untwined the blanket from her legs and got up, walking to the washroom.
