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1.as far as be concerned 2.has/have unpleasant association with sth. 3.an increasingly number of 4.point out 5.contribute to sth 6.proper measures should be taken to/great efforts should be made to 7.be questioned by 8.no one can deny the fact that 9.an recent investigation indicated that 10.tend to have farourable attitude towards sth 11.turn a blind eye to/turn a deaf ear to 12.pay a heavy price to do sth. 13.the most significant aspect of sth. 14.make it possible for sb to do 15.be obliged to admit the fact that 16.spare no effort to do 17.the information I`ve collected for many years lead me to believe that 18.pose a tremdous threat to sth. 19.produce a far-reaching infuence on sth. 20.live under illusion/down to the earth | 
