Hello everyone,

I am having a hard time with carry on and keep up.

1. How long can this situation carry on?
2. This awkward situation kept up for 2 stations…
3. This perplexing situation kept up for a while and I had to get to the bottom of it!

4. — Sunny day, isn’t it?
— Let’s hope the sunny weather____ for Saturday’s tennis match.
A. carries on
B. moves on
C. keeps up
D. goes up
Key C

I am totally confused with them.
Sentences(2,3) are similar to the second sentence in question4 (and I have no problem with the key “keeps up”), but what about sentence1? It comes from a dictionary; what’s more, I can’t see anything wrong with it. And I am sorry, I can’t see anything wrong with “How long can this situation keep on/keep up?”, either.

1. How long can this situation carry on?
4. Let’s hope the sunny weather carries on for Saturday’s tennis match.
Why sentence4 is wrong? There must be a nut hidden somewhere?


Thank you.