Помогите заполнить ответы!!!!! 1.America … by Columbus in 1498. a). is discovered b). was...

Помогите заполнить ответы!!!!!
1.America … by Columbus in 1498.
a). is discovered b). was discovered b). discovered
2.The houses … of stone and wood.
a) were built b)are built c). are being built
3.The article … already … .
a). had … been typed b). will be typed c). has … been typed
4.These letters … tomorrow.
a)are mailed b).were mailed c). will be mailed
5.The fish … very well.
a). was cooked b). had been cooked c). will be cooked
6.Moscow University … in 1755.
a). is founded b). was founded c).will be founded
7.Three foreign languages … in our school next year.
a). is taught b). was taught c). will be taught
8.The doctor … an hour ago.
a). send for b). is sent for c).was sent for
9.English … in many countries of the world.
a). is being spoken b). spoke c). is spoken
10.Most of the Earth’s surface(поверхность Земли) … by water.
a). is covered b) coveres c) was covered

1 b
2 b
3 c
4 c
5 a
6 b
7 c
8 c
9 c
10 a