We didn’t know you were in trouble at that time,otherwise we________ you a hand.[ ]

Though Professor Liu ____ in New York for seven years, he has never regretted moving back to Shanghai, his hometown

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

Our country should set up more national parks animals can live freely.

Large quantities of solid fuelconsumed every dayand too much carbon dioxide is sent into the air, which inturn ___the going up of temperature. [ ]