Exploring _____space is exciting, yet dangerous. There is _____need for both robots and humans for space exploration.
A survey was carried out on the death rate of those who were infected by Ebola Virus, __________were frightening.
_____ and I’ll get the work finished.
--- Look! The boy can speak English as fluently as English natives. --- Yes, and _____.
When I got back home I saw a message pinned to the door ____ “Sorry to miss you; will call later.”
The students were told that they _____ at the school gate at 2:00 the following afternoon.