I still remember that terrible accident a few days ago, ____ more than 20 pupils were killed.
| A．where | B．that | C．on which | D．which |
When we start gazing into the night sky with a telescope, soon we’ll be astonished by the realization _______ we and our world are part of this giant system.
| A．which | B．whether | C．that | D．as |
Karaoke, which was invented by the Japanese, ______ both wonders and problems.
| A．has been produced | B．was produced | C．produced | D．has produced |
Obama didn’t explain ______ any larger principles have guided him through the historic convulsions of the 2011 Arab Spring.
| A．what | B．that | C．where | D．whether |
I feel it a great honor ______ to give a speech here.
| A．to be asked | B．to have asked | C．being asked | D．to ask |
This is the first time that your parents have been abroad, ______?
| A．haven’t they | B．hasn’t it | C．aren’t they | D．isn’t it |