_______ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.
I regret____that we can’t stay here any longer.
I met him____________________. A. the first time B for the first time C. in the first time D. at the first time
He was the best_____playing chess.
As is known, mobile phone make it possible for people to____each other conveniently.
She knocked ________a cup of tea.