Our teacher did what she could ______uswith English

The singer is always very ______ to the reaction of the audience when she gives a performance.

Almost every teenager will experience a period in their life _____ they aren’t satisfied with their parents.

(2013·陕西宝鸡二检)Not until he went abroad for further study ________ how attached he was to his parents.

How about buying Sam a mobile phone? After all, he isn’t a boy any more.— I think it necessary, for we sometimes want to make sure if he _______ home for dinner[ ]