We have been excavating layers of ash almost six metres thick, which suggests that they________the fire burning all winter.
| A．should keep | B．might have kept | C．should have kept | D．might keep |
Can it be ______ in a fast-changing world we don’t know what to teach our children today?
| A．which | B．that | C．why | D．since |
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 |