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

It was unbelievable that the fans waited outside the gym for three hours just       ________ a look at the sports stars.

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.

The fireman told us the troubles they had ________ the fire ________.

 Please hand on the papers to those ________ at the back of the classroom.

Now that we've discussed our problem，are people happy with the decisions ________？

The children all turned ________ the famous actress as she entered the classroom.

The government plans to bring in new laws ________ parents to take more responsibility for the education of their children.

________ the right kind of training，these teenage soccer players may one day grow the international stars.

Nowadays people sometimes separate their waste to make it easier for it ________.

At the age of 29，Dave was a worker，________ in a small apartment near Boston and ________ what to do about his future.

In April,2009，President Hu inspected the warships in Qingdao，________ the 60th anniversary of the founding of the PLA Navy.

________ not to miss the flight at 15：20，the manager set out for the airport in a hurry.　　　　　　　　　　　　　　　　　　　

His conclusion, ______ on careful research, was acceptable.

With a basket on her back, the little girl is walking along the stream with green grass and red flowers ____ on both sides.

—Amy, please tell the people ______ for their turns to come to my office five minutes later. — Yes, sir. 

Three suspects ________ in the terrorist attack in Kunming have been caught.