I haven’t read ____ of his books, but judging from the one I have read I think he’s a very promising writer.

---Can I help you? ---I’d like to buy a gift for my mother, _____at a proper price but of great use.

September 8th，1931 is a special day，________, I think，that will be remembered by the Chinese forever. 

Tom told me that he needed a chair and that soon he found      .

—Are there any tickets left?    —Sorry. There are ________, if ________.