21.  Concerning the growing competition and increased downward pressure on prices, we must be creative enough to improve our competitive ability.

22.  What they think is that the feeling of love is an common emotion of human beings, collage students are old enough to taste this wonderful feeling of human beings.

23.  They are old enough to get in touch with the opposite sex.

24.  However on the other hand, as we are learning the chemistry so we are going to learn the vocabulary of Scientific English and remember a large amount of Scientific English words in a short time, so in my opinion only learning words from the reading materials is not enough and will take a lot of time.

25.  We will employ some famous painters all over the world to design the illustration on the brushes so that our products can be special enough to attract customers from different countries.

26.  The comeuppance came soon enough with large quantities of unequal treaties that humiliated the nation and forfeited our sovereignty.

27.  The rooms were not big enough but warm enough just for sincere consolation and encouragement from North Korean people.

28.  Then, the people there must be friendly enough to help the needy ones, especially the disabled and the elderly.

29.  I must be careful enough to arrange my time to better my skills instead of wasting time in playing outside.

30.  They consider that their sons or daughters are not mature enough to have love affairs.