These my friends and that my sister.
John didn’t go to bed ______he finished his homework. A.until B.after C.while
It took him half an hour _____ the work. A.doingB.to do C.did
The teachers are very friendly ______their students. A.to B.at C.on
His shoes are ___dirty ____he has to wash them . A.too, to B.so, that C.enough, that
She missed the bus,_____she had to walk home. A.so B.but C.because