_______ Peter is old and weak, he still has to work.
The world’s population is getting larger and larger, so scientists are trying to _______ new ways to solve the food problem.
Now more and more people ________ sending e-mails ________ letters.
He is ______ excited to hear the good news.
.Not all the students sitting in the back row can see the words on the blackboard _________.
---Our club has just finished an _______ documentary. ---Really? Can I have a quick look at it now?