One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
.—Do you want to go to the cinema tonight? —Sorry, I’m so tired. I ___________ an early night.
.With age, the mineral content of human bones decreases, ________ them more fragile.
.Let's go a little faster, ______________ we'll never get there on time.
.—How long have you been here? —Only about five minutes. Henry and Simon _____________ here with me.
.—Was _________________ problem solved? —We were trying to think of _________________ way out, but it was difficult to find one.