13. --Hi, Lydia. Are you going to the concert on Friday? - -I’d like to. But there are so many problems ____.
----- Why are they taking all the equipment away ? ------____________ , they are packing up to leave.
It is _____that he has been addicted to the drugs and has difficulty quitting it.
George Washington was born in 1732 in a rich family in _______ is now the state of Virginia.
_____ do you think will teach us math next term?
. The reason why I have to go is _____ if I don’t.