His sister left home in 1998, andsince.
had not been heard of
has not been heard of
had not heard of
has not heard of
—Jack bought a new mobile phone the other day. —______? That’s his third one in just one month.
Mum _____ to us, “Be quiet! Your sister is sleeping.”
.Don’t take too much of the medicine; it does you more harm than good if you ____.
There aren’t many seats left for the concert; you had better make sure ____ two today.
Examination compositions, together with most business letters and government reports, are the main situations ____ formal language is used.