How ___ is it from Xi’an to Dunhuang—It’s less than 3 ___ flight.

Thanks to the success of the business, we can ______ a flat this year.

The professor’s lecture has left a deep___________ on me and up till now I can still remember every word of it.

I wonder _____________without water.—About a week.

Participants in the program were 32 students identified ________ individual intelligence tests, group achievement test scores in math and science, and student interviews.