Early experiences taught me not to be overly _about shopping by mobile phone because there is a high risk of being cheated．

the topsoil of the earth is the subsoil, _____layer that contains stones mixed with a small amount of _____ organic matter

Could I ________a dictionary from you， David– Sorry， I _______ it to Mary yesterday.

No student ______ go out of school for snacks duringthe break without the teacher’s permission

Once you keep your school things________, you’ll find them easily.