. —You ought to have learnt all these sentences by heart. — , but I forgot everything when I was asked to recite them in front of so many students.
I just don't understand_____________ that prevents so many Americans from being as happy as one might expect.
The president of the country was well______ of when he was in power.
The gas tank____________ twenty gallons of gas, but now it may____________ only three gallons.
--The two pairs of shoes are __________ the same colour.--But they are different __________ colour.
Mr. Smith__________ the roll of film as soon as he arrived home