Gap-fill exercise

Fill in all the gaps, then press "[?]" button to get a clue.
Completați spațiile libere cu prepozițiile necesare. Puneți verbele din paranteze la forma Gerund.
Exemplu:
He finally succeeded ... (sell) his old car.
He finally succeeded in selling his old car.

1. The bad weather prevent him
last Monday. (...leave)
2. Our teacher doesn’t approve
late at night. (...study)
3. He worries
his position. ... (lose)
4. He finally succeeded
the letter. ... (post)
5. She insists
everything herself. ... (do)
6. This research aims
a more efficient method. ... (find)