If you are over 60 years old and are worried about \_\_\_\_(26)\_\_\_\_ and falling, you may want to consider \_\_\_\_(27)\_\_\_\_ your alcohol intake. Researchers have found that drinking one can of beer can immediately influence elderly citizens' sense of balance; they would have difficulty to lift their legs high or to \_\_\_\_(28)\_\_\_\_ obstacles while walking. As a result, they are twice likely to hit obstacles compared with younger people. Inability to avoid obstacles usually \_\_\_\_(29)\_\_\_\_ a higher risk of falling. So, if you are older, avoid walking under the \_\_\_\_(30)\_\_\_\_.