Some students have trouble ____ grammar while others have difficulty ____ new words[ ]

Mary is tired of learning because she is_______ to do better than she, both at school and at home.

– How long has this church been inservice—-_________1682, I’m afraid

下列各项中，加横线的成语使用恰当的一项是（ ）

_____ does your sister go to school –She goes to school in my father’s car.