________ happens in the world makes us happy and sad by turns.
| A．That | B．What | C．Which | D．Whether |
No one has _____ been able to trace the author of the poem.
| A．still | B．yet | C．already | D．just |
The ship was _____ in a storm off Jamaica.
| A．drowned | B．sunk | C．wrecked | D．submitted |
She was afraid that unless the train speeded up she would lose her _____ to Scotland.
| A．ticket | B．place | C．seat | D．connection |
Henry's news report covering the conference was so _____ that nothing had been omitted.
| A．understanding | B．comprehensible | C．comprehensive | D．understandable |
We already have ______ pencils, but we need two ______ pens.
| A．dozen of, doze | B．dozens of, dozens | C．dozens of, dozen | D．dozens of, dozen of |