We used to see each other ____ but haven't heard from him since last year.(2012 .辽宁)
She’s so ______ that no one can please her.
___________ ill worried my parents greatly.
E-mail, as well as telephones, ______ an important part in daily communication.
To improve the quality of our products, we asked for advice had used the products.
His first book next month is based on a true story.