- Do you know where my address book is? - It________ be in the hall cupboard. I think I saw it this morning.
Mike did the homework ________ it took me.
With increasing working pressure, Anthony has ________ time to spend with his friends than before.
Though many extra trains and buses are used to carry passengers, traffic tools are still ________ needed during the Spring Festival.
Mary once taught English in a remote village school as a volunteer, which is ________ only on foot.
Cheer up! No matter how ________ you progress, you are ahead of those who never tried.