People say, “Guilin’s scenery is matchless in the world.” It was not until I visited the place _____ I found it really worthy of the reputation.

tired professor, _____ in his new book in thepast three years, hasn’t realized the decline in his health

Most Americans would prefer to keep their problems_______ themselves and solve their problems_______ themselves.

Those overseas students volunteer 10 hours each week in Paris ______ free food and accommodation[ ]

The manager got to the company in a hurry, only to find that he ______ his laptop back at home.