Economy is booming, so it is hard for some of the firms to _____ enough labor , though their working conditions are rather good.
Even though they are not doubtful at all _______ John will pass the exam, I still wonder ______ he is fully prepared.
Tim is always lying, thus no one will believe _______ he says.
______ the scene, he couldn’t help thinking of the description in a book ____ by a British novelist.
________ many changes have _______, we should keep pace with the changes too.
The fire spread through the hotel very quickly but everyone ______ get out.