---It is high time that we _______ to school. ---If only the alarm clock _______! A. should go; rung B. shall go; had rung
—Could I use your bike? —Yes, surely you ______.
He couldn’t ______ the fact that the money was found in his house.
Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
—Don’t forget to visit me when you come to Beijing. —______.
—Your mother becomes more and more forgetful. —Yes. She searched for her cellphone for a whole day last Sunday but it ______ in her coat pocket the next day.