Jim has retired, but he still remember the happy time _______ with his students.
to spend
spend
spending
spent
(陕西)No sooner ________ stepped on the stage than the audience broke into thunderous applause.
Only when you leave school________how much you love it.
So mysteriously ______ missing that many puzzles wait to be solved.
For a moment nothing happened, and then ______ all shouting together.
---I have finished my homework. ---___________.Let’s go to play tennis.