Alice promised me to come round to keep you company today.—But she ________. I’ve been alone all day.

81. ________is a kind of food made frommilk curds.

The world’s population is getting larger and larger,so scientists are trying to _______ new ways to solve the food problem.

–Fancy meeting you here.–_______

Her throat has been operated on, _____, she has to give up singing[ ]