When I saw mum nod _______ to me, I calmed down and went on with my acting.

 Nature reserves are very important for preserving many animals and plants, which would _______ run the risk of becoming extinct.

The boys are doing no harm; they are ___ playing．

 He said it was _____ impossible to buy the novel which was _____ worth reading.

A short, thin woman,          past middle age, visited the manager and applied for the job．