y, do remember to leave things _____ you canfind them again

been puzzled over the problem for over an hourwithout any result, ____ all at once the solution flashed across my mind

His promise ___ he would marry her when he came back turned out to be a lie, ___ left the girl heart-broken.

From where I stand， the key to the test is to practise Englishevery day.

－So you gave Mary your dictionary－______.She said she’d return it to me when she could afford her own.