48. Don’t respond to any emails _______ personal information, no matter how official they look.
--Why has he been staying at home these days? --He ___________ since a month ago.
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.