Read the sentences. Tick the sentences that are correct or underline the mistakes.

1 Who’s going to speak at the annual conference this year?
2 Just focus to doing your homework.
3 I’ve only just figured up how to use my new mobile.
4 I’ve just noticed that you’ve got a new car!
5 Have you ever wondered how a mobile phone works?
6 A famous author is making a lecture here tonight.
7 Are you going to participate at World Science Day this year?
8 I’ve never entered in a design competition before.
9 I’m nervous because I’ve never led a workshop before.