He told me the news，believe it or not，________he had earned＄1,000 in a single day.
| A．that | B．which | C．as | D．because |
_______ I have never thought of getting a job in such a big company, I’ll have a go at it.
| A．Since | B．Unless | C．Once | D．While |
Not only _______ many people’s lives by reducing fever and helping stop pain, but there are also other things that aspirin can help with.
| A．has aspirin saved | B．has saved aspirin |
| C．aspirin has saved | D．saved aspirin has |
It is vital that every piece of equipment ________ checked before the experiment.
| A．would be | B．must be |
| C．should be | D．might be |
Stamp collectors collect stamps relating to a particular theme. Sport lovers may try their best to find Olympic stamps ________ by various parts of the world every four years.
| A．publishing | B．being published |
| C．published | D．having published |
Bob spent six months alone on his boat. _____, Ann took care of the children on her own.
| A．However | B．Also | C．Meanwhile | D．Besides |