Ihavebeenstudyinghereforfouryears,bynextsummerI________.
A、shallgraduateIhavebeenstudyinghereforfouryears,bynextsummerI________.
Tosucceedinascientificresearchproject________.
Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
Howlong________they________(dig)theditch?
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
