17.I’m ____a diet, since I put ____ weight easily.
The film has been well received, but____actual sales, it hasn’t been very successful.
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.