Why didn’t Mr. Smith arrive on time for the meeting?— He must have been ________ on his way here in the traffic jam.

How do the shops make money if they sell at such low prices?-Manufacturers, it seems, are willing to bring down prices _______ big volume purchases．[ ]

I have got 50 points in the English exam. —__________________.

We are much _____ with the standard of the children’s work on the exhibition.[ ]

The twin sisters have learned a lot ________ they came to China.