He found it increasingly difficult to read, ______ his eyesight was beginning to fail[ ]

Do you think if Tom _______ the work well—I think he will if he ______ his best.

_______ application of transgenic technologyshould be restricted on all food production andthe government should take _______ “scientific attitude” toward geneticallymodified food.

Alice, do you know tomorrow

They decided ____________ by bus.