I can never forget the days _____ we worked together and the days _____ we spent together.A. when; which B. which; when C. what; that D when; when
You should be more careful, _______ you might meet with some accident.
One _______ fact is _______ Crystal always keeps a toothbrush in his pocket for good luck when he is the host of the Academy Awards.
The UN is _______ countries that want to increase peace.
--- I will go to your place at 3:00 tomorrow afternoon. --- I’m sorry, but I ______ to Beijing by then.
If you ______ the chat room ten minutes ago, you _______ what we were talking about.