—Does Peter have a tennis racket?— ________ . But he has some tennis balls.

I am afraid that Mrs. Black doesn’t believe her son is able to design such a complicated machine,       ?

---Jack , you shut the window quickly,______? ----Ok!Oh! The window is broken.

 一____________?             一It’s a ruler.

—Nothing wrong with it, ____________?— Yes. The computer says, “Please check this disk before entering data.”