Could I use your computer? —Sorry, I’m going to_____ it now. [ ]

Is the Nanjing Bridge open to the public yet?—Yes. It ____ for almost one and a half months .

He is _______ clever boy that he can solve _____ many difficult problems.

Do you have toys? I’d like to buy ______ for my cousin.

Is this your bicycle, David? —No, it’s not . It’s Helen’s.