________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as |
| C．If only | D．So long as |
I bought a dress for only 10 dollars in a sale ;it was a real _______.
| A．exchange | B．bargain | C．trade | D．business |
—I wonder how much you _______for your servives.
---Well ,the first two are free while the third costs $30 .
| A．bargain | B．charge | C．offer | D．donate |
The sign at the entrance to the club says ,“Children without the company of an adult are not to be _________.”
| A．admitted | B．joined | C．limited | D．entered |
I might buy a TV ,if I can find a ______in the sales .
A bargain B trade C business D exchange
Children under 18 will not be ______into the pub in this country .
| A．designed | B．decorated | C．competed | D．admitted |