Gerund ? / Infinitive ?

Gap-fill exercise

1. I had to ask the boys (stop) (ride) their mini-scooters in the corridor. 2. Don't start (try) (learn) algebra before you have finished (learn) (do) simple things in arithmetic. 3. We can't think of (buy) a new house before (sell) the old one. 4. I'd love (have) the opportunity of (meet) you again. 5. Our teacher has promised (help) us (prepare) for next week's test. 6. I hate (get up) early in winter and (get ready) in the dark. 7. If you can't fix that old thing, try (hit) it with a hammer! 8. I saw her (sit) at the bus stop, and I heard her (tell) her friend not to wait for her. 9. Poor Charles! The police suspected him of (try) (sell) stolen bicycles. 10.Can you manage (finish) (pack) these parcels alone?