____________ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.

Excellence is not difficult ---simply decide right now to give it your best shot---____you will be amazed with ___ life gives you back.

There is no doubt _____ China has made rapid progress in space exploration.

The shop manager always says to his assistants, "We can never be______customers.

It was in the street ______ I met John yesterday.