________hard you try, it is difficult to lose weight without cutting down the amount you eat.
It was ______ of you not to give others a ride in your new car.
Lily’s mobile phone was left in a taxi accidentally, never ______ again.
At first the institute refused to purchase(购买) the experiment instrument, but this decision was ______ changed.
The shy girl felt ______ and uncomfortable when she could not answer her teacher’s questions.
Don’t get upset—I was only ______. .