Many of them turned a deaf ear to his advice, ________ they knew it to be valuable.
| A．as if | B．now that | C．even though | D．so that |
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 |
Mr. Smith _____ the idea that the welfare system should be improved as soon as possible.
| A．contributed to | B．adjusted to |
| C．attended to | D．subscribed to |
Peter _______ annoyed on the phone, but I really had no idea what was wrong.
| A．proved | B．sounded | C．appeared | D．fell |