I can’t get through to the general manager’s office anyhow.—— The line is busy. Someone _____ the telephone.

To avoid his shop being stolen again, he thought it over and at last decided to set a security________ in it.

There is ________“s” and ________“f”in the word “useful” .

NASAhas made a ________ that our earth has no threat associated with the film 2012which is based on pure myths

How much do you think that vase _____?