Put in by or until.
I think I’ll wait *** Thursday before making a decision.
Fred has gone away. He’ll be away until Monday. (by/until)
Sorry, but I must go. I have to be at home by 5 o’clock. (by/until)
I’ve been offered a job. I haven’t decided yet whether to accept it or not. I have to decide by Thursday. (by/until)
I think I’ll wait until Thursday before making a decision. (by/until)
It’s too late to go shopping. The shops are only open until 5. 30. They’ll be closed by now. (by/until)
I’d better pay the phone bill. It has to be paid by tomorrow. (by/until)
Don’t pay the bill today. Wait until tomorrow. (by/until)
A: Have you finished redecorating your house? B: Not yet. We hope to finish by the end of the week. (by/until)
A: I’m going out now. I’ll be back at 4.30. Will you still be here? B: I don’t think so. I’ll probably have gone out by then. (by/until)
I’m moving into my new flat next week. I’m staying with a friend until then. (by/until)
I’ve got a lot of work to do. by the time I finish, it will be time to go to bed. (by/until)
If you want to do the exam, you should enter by 3 April. (by/until)