It was probably at that moment _____ I understood what kindness really was.
| A．that |
| B．when |
| C．which |
| D．what |
——Tomorrow ____ my birthday. I’d like you and Jane to come.
——I’m not sure if she ____ free.
| A．will be; is | B．is going to; is | C．is; is | D．is; will be |
This problem may lead to more serious ones if ____ unsolved.
| A．making | B．remained | C．keeping | D．left |
She felt sorry that she had disturbed the ____ calmness of a man she respected.
| A．regular | B．curious | C．usual | D．various |
If you live in the country or have ever visited there, ____ are that you have heard birds singing to welcome the new day.
| A．situations | B．facts | C．dances | D．possibilities |
His letter was especially welcome as I ____ from him for long.
| A．haven’t heard | B．would not heard | C．hadn’t heard | D．didn’t heard |