Complete the sentences with the phrases in the box.

Sentences: at last, at least, at the beginning, at the end, at once, at present, at first, at the latest, at the moment.

1. All visitors should leave the space center by 5:15 _______, because we are closing.

2. For a good telescope, you need to pay ______ £150. Don't get anything cheaper.

3. ______ of the race, Brad was doing well,but _______ of the race, he was exhausted and almost didn't finish.

4. Linda will call you later, OK? She's watching a documentary about space exploration ______.

5. ______, I thought my brother was joking, but then I realised that he was serious.

6. ______, after four days, the scientists were able to find what was polluting the river.

7._______, children are not allowed on space flights.

8. I need to speak to Mary immediately. Tell her to come here ______!