The dog, if trained _____, will be made a good watch-dog one day.
. To qualify yourself for this kind of new job, I recommend that you____some online courses.
. . I ______ my university professor in the supermarket near my house, which was out of my expectation.
. In 1942,Columbus and his crew arrived ____was then called the New World by the westerners.
. He feels it dangerous for a girl to be out late at night so he won’t have his daughter_____ home late.
. With no one to ______ in such a frightening situation, she felt very helpless.