19. I wondered_____that made him so upset.
| A． how it was | B． which did it | C． what it was | D． who did it |
Teach children ______ electrical appliances, cords, and switches are not toys.
| A．what | B．which | C．how | D．that |
In Section Three, you are most likely ______ on your ability to find factual information.
| A．to test | B．testing | C．to be tested | D．being tested |
Because it was the bank’s mistake, there was no delay ______ my account.
| A．being reopening | B．reopening | C．to reopening | D．to reopen |
We can hardly believe his excuse for his late show _______ his car broke down halfway.
| A．why | B．that | C．where | D．as |
He went to Paris the next year, ______ he lived and was never back.
| A．where | B．when | C．which | D．that |