Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa?
| A．when | B．that | C．after | D．since |
. You____ think you are clever, but that doesn’t give you the right to order me about.
| A．may | B．can | C．must | D．should |
--- I think this accident happened for many reasons.
--- Richard is partly to blame, _______ way you look at it.
| A．what | B．which | C．whatever | D．whichever |
. -You won’t go to Mary’s birthday party, will you?
-Yes, ______ I’m invited.
| A．even if | B．unless | C．if | D．though |
The newspapers in my hometown don’t contain as many colorful pages as the ones in Nanjing ____.
| A．contain | B．do | C．appear | D．seem |
A brilliant idea occurred to him, ________ to his research in the lab.
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |