You may ______ it that Jennifer will come and help us if we are in trouble.
.– I like your house very much.--- Thank you, but this house is ________.
________, no one is sure who discovered America .
As I ______, I suddenly remembered that it was your birthday.
The history of nursing ___ the history of man.
– Do you enjoy listening to records?--- I think records are often ______ an actual performance.