Task 2. Choose the correct preposition.

1. Please, call me ... (while/as soon as/till) you arrive at the station. - Please, call me *as soon as* you arrive at the station. (Пожалуйста, позвони мне, как только приедешь на станцию.) 2. ... (Until/After/Before) going to sleep, she likes reading a book for an hour or so. - *Before* going to sleep, she likes reading a book for an hour or so. (Прежде чем заснуть, она любит читать книгу около часа.) 3. Don't sit down ... (until/after/while) we ask you. - Don't sit down *until* we ask you. (Не садитесь, пока мы вас не попросим.) 4. The house became empty ... (after/before/until) they left. - The house became empty *after* they left. (Дом опустел после того, как они уехали.) 5. I won't start my journey ... (when/while/until) he pays all my expenses. - I won't start my journey *until* he pays all my expenses. (Я не начну свое путешествие, пока он не оплатит все мои расходы.)