重写句子：Alanpassedthetest.Alanhadstudiedhard.Alanhadunderstoodthematerial.(complexsentence)
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.
A、expanded
B、emerged
C、descended
D、conquered
Thefarmingmethodshavebeen________improvedwiththeinventionofthenewmachine.
A、efficiently
B、proficiently
C、professionally
D、intentionally
Hewas______towithdrawfromrunningforthepresidency.
A、trusted
B、credited
C、convinced
D、believed
Theprofessorworkedfor7hoursata________.
A、stretch
B、extend
C、expand
D、prolong