While he was ______ about in the street, Mary came up to him.
. It is _____that he has been addicted to the drugs and has difficulty quitting it.
. That was the first time I _______ there and I was impressed by the friendly people very much.
. 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.