I woke up at mid-night and went to the toilet, but I couldn't fall asleep anymore. I woke up at midnight and went to the toilet, but I couldn't fall asleep anymore.

I woke up at mid-night and went to the toiletbathroom, but I couldn't fall asleep anymorefter that. I woke up at midnight and went to the bathroom, but I couldn't fall asleep after that.

I went hiking today with several travellers living in the hotel. I went hiking today with several travelers living in the hotel.

I went hiking today with several traveller livs staying inat the hotel. I went hiking today with several travellers staying at the hotel.

The other commenter deleted an 'l' from traveller, but since you use British spelling it's actually correct.

I was so happy, there was s. Something unhappysad but unimportant happened, though. I was so happy. Something sad but unimportant happened, though.

I was so happy, but there was something unhappy but unimportant that had happened though. I was so happy, but there was something unhappy but unimportant that had happened.

I had donedid many things today. I did many things today.

I hadve done many things today. I have done many things today.

There was sSomething unfortunate happened in my friend's family, so she wouldill go home tomorrow. Something unfortunate happened in my friend's family, so she will go home tomorrow.

There was sSomething unfortunate happened in my friend's family, so she wouldill go home tomorrow. Something unfortunate happened in my friend's family, so she will go home tomorrow.

Put the other sentence about this right above this one instead of behind these other two sentences.

I was wondering whether I would stay one more day because there was's not going nto be anymore vacation this term, and I hadve to work on the 7th this month. I was wondering whether I would stay one more day because there's not going to be anymore vacation this term, and I have to work on the 7th this month.

I was'm wondering whether I would stay one more day because there was going. There are no more vacations this term, and I hadve to work on 7th this month. I'm wondering whether I would stay one more day. There are no more vacations this term, and I have to work on 7th.