There is no doubt________man will continue to explore the vast universe in the future, but the rate at which we approach depends on the development of technology.[ ]

He is so busy with the research _____ he has no time left for any other activity.

here are many different types of food, some animals spend their lives eating only one type.

We prefer to measure our football team’s success _____ the number of fans attending rather than the number of games won

______ about their opinion of the effect ofmodern equipment on their performance of tasks, many young people gave apositive response