When it comes to modern communication, network safety is always a major ______ .
A.concern B.advantage C.opportunity D.solution
——I'm afraid I can't complete the marathon next week.
— ______ ! You have been practicing a lot.
A.No problem B.Go ahead C.Cheer up D.Good luck
We must fully obey traffic rules, otherwise everything would be ______ .
A.out of touch B.out of order C.out of date D.out of sight
China National Women's Volleyball Team made great achievements, ______ them a symbol of the spirit of China.
A.to make B.having made C.made D.making
The most important promises we must keep are ______ we make to ourselves.
A.Ones B.those C.these D.them
People _______ about what our future will look like for thousands of years .
A.have been wondering B.wonder C.wondered D.will wonder
