1.I .................. football very often when I was young. (1 Điểm) was going to play was playing played 2.Many people decorate their homes ...................... Christmas. (1 Điểm) when on at in 3.Children believe a fat, jolly man brings gifls .................... Christmas Eve. (1 Điểm) on when at in 4.We live ..................... the 21st century. (1 Điểm) in on for at 5.I used ....................... fishing. (1 Điểm) to enjoying enjoy enjoying to enjoy 6.It's hard work looking ....................... three children all day. (1 Điểm) at about before after 7.Costa Rica sounds ..................... a great place for a relaxing vacation. (1 Điểm) similar as like same 8.I am not happy ...................... his work this term. (1 Điểm) to of with on 9.He  ....................... his words carefully. (1 Điểm) spoke collect chose use 10.An oil .................... burned in the darkness. (1 Điểm) lame lamp lam lamb