Did you go to Jack’s birthday party——No, I_________.

___ I ask you something, if you are not busy—Yes, ofcourse you _______.

________ the pressure increased day by day, students devoted themselves to their study not tolet their parents down.[ ]

If there are ______ trees, the air in our city will be _______ cleaner.

The president was so absorbed in his work that not a sound ______.