Which one of the underlined words or phrases is INCORRECT? One of the biggest problems in developed countries today are …

Ahmed .............. a good horse rider, but then he got injured.

I ......... for the lecture to start for almost an hour. I don't know why it is delayed.

I can't come jogging; I don't have...................... running shoes.

I've been lazy this week. I haven't read a single page in the book… ........ Sunday.

Sara: Help! I lost my key and can't get into my house! Mona: Don't worry, I... ............. send my son to help…