1 ........ he studied E well
2 .......they understood how to begin the games on the computer
3 ....he could take part in the trip to City Museum
4 ..... was made by my aunt for her son
5 Mrs. Nam has worked in that school for 4 years
6 Đúng rùi
7 .... were planted by my sister last month
8 ....to go to school late last year