31. A wonderful idea suddenly occurred to me _______ I would turn to the reference book to finish my homework
You should avoid _______ for your class.
There ______the school bus. Hurry up!
Nowadays, how we can take good care of _______old is becoming _______hot and serious topic.
Don’t worry about the baby not wanting to leave you----it’s a stage _______they all go through.
It was proposed by the board that our school _____ more advanced teaching methods.