11E - There's a big difference between an ordinary radio and a digital radio.
12G - Use my credit card to pay for the tickets and give me the cash later.
13C - Jim spent all his money on playing video games.
14A - I lent my new computer game to Daniel and I don't think I'll get it back for a while!
15I - Sometimes a simple idea can result in an invention that changes the world.
16D - I saw an advertisement for a watch that also plays TV programmes.
17H - There's something wrong on which laptop to get for my dad. (Это предложение звучит немного странно, потому что не подразумевает конкретного вопроса или проблемы, но это наиболее подходящий вариант из имеющихся)
18B - You have to connect the computer to the power or it won't work.
Лишняя часть: F - with the DVD player we bought last week.