With all his efforts_____ on helping the company survive in the competition, the new manager is loved by all the staff[ ]

I was still sleeping when the fire _ ___，and then it spread quickly.

f the students have hardly ever beento the Grand Canyon, __

Mrs. Bond is a good teacher, he is also an old friend of __________.

To live on Mars, you need to wear boots which ________ to prevent you from floating off into space.