Our teachers often advise us ________ carefully in class.

Only by studying hard ________ improve her Englishsoon.

It’s eight o’clock already. Jack _____be here by now. — Oh, he told me that he was going to see his dentist and wouldn’t be back until ten. [ ]

It saves time in the kitchen to have things you use a lot________easy reach.

．From what we get，we can ________ a living；what we give，however，makes a life．