—Whose book is this? — It _______ our teacher’s. You see, his name is on it.
Although he is a little boy,_____he speaks English well.
——I have a sore thoat. ——________.
_____can work out the problems because _____of the problems is easy.
I have to look after____and ____sister today.
The doctor gave me some medicine____my cough and told me to take it _____a day.