Exploring _____space is exciting, yet dangerous. There is _____need for both robots and humans for space exploration.
--What can I do for you? -- If you __________ see Mr. Smith, give him my regards.
In this institute, a medal with nine thousand dollars __________ gains success in science and technology every other year.
His plan, as well as Mary’s, sounds original. But the company, I think, won’t agree to __________ of them, for they are unrealistic.
After two years’ study, he now has a __________ better command of English.
Melissa, __________ the alarm clock for 6 o’clock, or you will oversleep and be late for the train.