I don’t think the risk they took ______ the poisonous snake is worthwhile.
| A．being caught | B．of catching |
| C．caught | D．to be caught |
. When he was working there he caught a serious illness from _____ efforts he still suffers.
| A．which | B．that | C．whose | D．what |
Luckily, we’d brought a road map without ______ we would have lost our way.
| A．it | B．that | C．this | D．which |
Is this the reason _______ at the meeting for his carelessness in his work？
| A．he explained | B．what he explained | C．how he explained | D．why he explained |
In the office I never seem to have time until after 5：30 pm, _____ many people have gone home.
| A．that | B．which | C．whose time | D．by which time |
All of the flowers now raised here have developed from those _______ in the forest.
| A．once they grew | B．they grew once | C．they once grew | D．once grew |