—Do you have ________ difficulty working out the problem?—Yes. It is ________ me.
He’ll never forget the years _______ he studied in Oxford University.
.The actress looks very young but _______she is more than forty years old.
_______ the satisfaction of our customers, the products worked very well.
She gave me the suggestion that I try to ________ some money every month for special use.
Whenever we are in ____ trouble, we should never lose______heart.