At home, he keeps some pets,to which he ______ all his spare time.
A person's __________ body temperature is about 37℃.
The program, __________ at improving the students' ability of listening and speaking, will surely be a success.
He didn't answer, with his gun __________ at David.
Teachers are now aware of the difficulty that some students have __________ attention.
—I made it at last. I am on top of the world! — __________