Prices of daily goods _______ through a computer can be lower than store prices.
| A．are bought | B．bought | C．been bought | D．buying |
_________ is known to all，good friends _________ happiness and value to life.
| A．It； add | B．As； add |
| C．It； add up | D．As； add to |
－－When _______ we meet again?
－－_______ it any time you like.
| A．will； Do | B．will； Make |
| C．shall； Do | D．shall； Make |
－－Can you finish the writing on time?
－－_________.
| A．Never mind | B．With pleasure |
| C．No problem | D．All right |
Is oxygen the only gas _______ helps fire burn?
| A．that | B．/ | C．which | D．it |
During the days ________, he worked as a servant at the Browns.
| A．followed | B．following | C．to follow | D．that followed |