After months of voyage, Columbus arrived in what later to be a new continent.
| A．had been proved | B．was proved | C．had proved | D．proved |
Nothing but two ancient Chinese coins ＿＿＿＿ after they took out the jar.
| A．did they find in it | B．they found in it |
| C．in it did they find | D．in it found they |
＿＿＿these ancient buildings in this city are!
| A．What perfectly protected |
| B．How perfect protected |
| C．How perfectly protected |
| D．What perfect protected |
＿＿＿＿＿,she may not catch up with her sister Lisa.
| A．Hard though she works |
| B．Hard although she works |
| C．Hard works she |
| D．Hard even if she works |
You can see a large signal on the wall：＿＿＿＿!
| A．Long lives the PRC | B．Long live the PRC |
| C．Long does the PRC live | D．Long do the PRC live |
Only since they gave up that good chance＿＿＿ to show their invention again.
| A．have they had no chance |
| B．they have had no chance |
| C．they have no chance |
| D．have they no chance |