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People believe that the China Dream is not very difficult  ________ so long as the whole nation works hard for it.

We entered the café and sat down by the window, waiting ________.

With so many exercises ________， the students are having a hard time.

Whom do you expect to have      ________  the baggage to the airport?

The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.

The boy, ________ with his school work every day, felt rather tired and wanted to have a     whole day to relax.

We've had a good start, but next, more work needs    ________  to achieve the final success in English study.

You can spend your free time in our library.There is a reading room ________ more than 600 students.

The students in our school expected ________ more time for reviews and exercises before the College Entrance Examination next year.

All reference books ________， he didn't find the key to the question.