Unless ____ to speak, you should remain silent at the conference.
A invited B inviting C being invited D having invited
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It makes his life quite different ________he has received education abroad．
| A．that | B．which | C．what | D．how |
_______ you call me to say you are not coming, I’ll see you at the theatre．
| A．Until | B．If | C．As | D．Unless |
He apologized for his mistake, saying that he ___________no offence．
| A．supposed | B．intended | C．considered | D．pretended |
Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years _________ it has warmed in the 20 000 years since Ice A
ge．
| A．as long as | B．as much as | C．as soon as | D．as well as |
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