Fred entered without knocking and, out of breath, sank________ a chair.[ ]

With all his efforts_____ on helping the company survive in the competition, the new manager is loved by all the staff[ ]

This morning our head teacher came toschool _________ than ________ student in our class.

It rained heavily in the south,_____ serious flooding in several provinces. [ ]

I ______ my university professor in the supermarket near my house, which was out of my expectation.