Complete the sentences with the correct words using the right forms. The first two or three letters of each word are given.

Write the missing letters in each gap.

I have problems with my laptop. Can I ex[ ] it at the store?

The signal of my mobile phone is really po[ ]. I can't call my friends when it's so weak!

Your voice recorder doesn't work. If you have a guarantee cer[ ], we can exchange it.

My camcorder is not working because I have dr[ ] it on the floor.