$\text{7 They started working in that factory in 2001.}$
$\text{8 He has worked for this company for 5 years.}$
$\text{9 They have lived here for 10 years.}$
$\text{10 Lan has learned French since 2000.}$
$\text{12 They have checked the machines for 2 hours.}$
$\text{14 She has cooked the soup for half an hour.}$
$\text{15 We have done the test for an hour.}$
$\text{16 Jack has planted flowers for 3 hours.}$
$\text{18 Nam has learned English since 1998.}$
$\text{19 Bang has raised birds since May.}$
$\text{20 Van has collected stamps since Sunday.}$
$\text{21 Hang has listened to music since 8 o'clock.}$
$\text{22 Mai has made a dress since Saturday.}$
$\text{23 He has watered the vegetables since nine.}$
$\text{24 Khanh has played computer games since 2002.}$
$\text{27 Minh has sold lottery tickets since June.}$
$\text{28 It has rained for an hour.}$
