I think English is ______ useful language, and it’s also ______ important language.

“I don’t like the way you treat your customers.” Mr. Young said to Simon.

Were you at home at 7:00 last night—Yes，I______at that time.

Pity you missed the lecture on nuclear pollution —I _______ it, but I was busy preparing for a job interview.

I’m sorry. __________ for my illness, I would have come to give you a hand.