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

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 Earths surface(поверхность Земли) by water.
a). is covered b) coveres c) was covered