—— Tom, did Mr.Li join you in your dicussion?—— No, he____, but he happened to have fallen ill.
His father disappeared, ________ two children and never _______ from again.
Does the way you thought of ________ the water clean make any sense?
In order not to be disturbed, I spend three days _______ in my study.
He tried to ________ in Japanese.
They ‘ll have other meetings like this in the weeks ________.