future tense in invention

my invention ..... many student

• is going to help

• are going to help

• is going to be

• is going to invent

Anna and Diana ...... the newest phone from Samsung

• is going to buy

• are going to buy

• is going to be

• are going to be

the materials of my gizmo ..... very economical

• is going to sell

• is going to be

• are going to sell

• are going to be

This invention ..... the most cutting edge invetion of all times

• is going to be

• are going to be

• is going to show

• are going to show

there are many inventions that ...... to help people in daily basis

• are going to be

• is going to be

• are going

• is going