Если посчитать не учитывая пример, то получится, что в первом столбике одно лишнее (там где я поставила прочерк).

What do we need to play football?
We need a ball to play football.

What do we need to learn about computers?
We need a computer magazine to learn about computers.

What do we need to go to the rain forest?
We need a _____ .

What do we need to send a letter?
We need a stamp to send a letter.

What do we need to take photos?
We need a camera to take photos.

What do we need to climb down the cliff?
We need a tope ladder to climb down the cliff.

What do we need to design a space  shuttle?
We need a computer to design a space shuttle.

What do we need to make some pancakes?
We need a frying pan to make some pancakes.

What do we need to get to the taiga?
We need a plane to get to the taiga.

What do we need to go to the Moon?
We need a spaceship to go to the Moon.