Doctor Nathan is said to have been ________to researching into wild animals inAfrica for more than ten years.

________is no need for you to come if you don’t want to [ ]

Yesterday our head teacher made such an　____　speech that we all felt　_____.

How was your interview with the famous basketball player-Yao Ming? —I was quite nervous at first, but his warm smile put me____[ ]

People who can see with their eyes can’t understand _____ practical use Braille can be of for the blind.