It was never clear ___________ the man hadn't reported the accident sooner.
| A．that |
| B．how |
| C．when |
| D．why |
.----Were all the toys for the children carried to their kindergarten?
----No,____ only some of them.
| A．It was | B．they ere | C．there were | D．there was |
.He arrived in Hollywood in ,____some time later,he became a foamous actor.
| A．when | B．where | C．that | D．which |
.We cannot figure out ____quite a number of insects, birds, and animals are dying out.
| A．that | B．as | C．why | D．when |
.----What did he want to know,Anne?
-----_______I could finish writing the report.
| A．When was it | B．It was when that | C．It was when | D．When it was that |
. _____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.
| A．As; whom | B．What; whom | C．It; whose | D．As; whose |