—Did you return Fred's call?
—I didn't need to ________ I'll see him tomorrow.
| A．though | B．unless | C．when | D．because |
They each ____ a beautiful handkerchief.
| A．have | B．has | C．there is | D．there are |
Each of the students _____ a Chinese-English dictionary.
| A．have | B．has | C．there is | D．there are |
Mathematics ____the language of science.
| A．are | B．are going to be | C．is | D．is to be |
Half of his goods ____ stolen the other day.
| A．are | B．were | C．is | D．was |
That they were wrong in these matters _____ now clear to us all.
| A．is | B．was | C．are | D．were |