Pictures:

What begins and ends with E but has only one letter?

Envelope.

950

What invention lets you look through a wall?

A window.

960

Why couldn't the leopard play hide and seek?

Because he was always spotted.

990

What 5 letter word becomes shorter when you add 2 letters to it?

The word 'short'.

988

When does Friday come before Thursday?

In the dictionary.

992