Two-thirds of the area ________ with trees .
[ ]
A．are covered
B．is covered
C．have covered
D．has covered
The number of the workers in our factory ________ in yours .
A．is more than that
B．are more than those
C．is larger than that
D．are larger than those
________ a hard-working race .
The old ________ .
There ________ only a bed besides some desks and chairs in Li Lei's room .
The old man as well as his two daughters ________ paying a visit to China now .
All that can be done ________ .
Thirty percent of the students ________ from the north . The rest of them ________ from the south .
I have had my coffee. The rest in the pot ________ for you .
Thirty-seven years ________ not long in the history of mankind .