17.
1.where did they play tennis last Sunday? who played tennis in a new court last Sunday? what did they play in a new court last Sunday?
2.How many articles did she translate yesterday? when did she translate two articles?
3.where was he three days ago? who was in the swimming pool three days ago? when was he in the swimming pool?
4.what did we send you yesterday? when did we send you the e-mail?
5.where were the pupils half an hour ago? who was in the gym half an hour ago? when were the pupils in the gym?
18.
bought/discovered/knew/thought/was/became/had/embarrassed/left/shouted/continued/was/grabbed/put/had/said/opened/threw/closed/was/opened/removed/walked/sat/spoke/say