— Thanks for your help, but can you do me one more favor, please?— ________, Sir. What’s it then?
We found______ impossible to finish the work on time.
John received an invitation to a dinner, and with his work____, he gladly accepted it.
______ students should be given more free time is suggested by many experts and welcomed by kids in school.
Only when he returned______ the truth.
Some insects ______ the color of their surroundings to protect themselves.