2. When I entered the room, I was surprised at what I saw.
3. The rain prevented the volunteers from mowing the old lady's lawns.
(S + prevent + SO + from + V-ing : ai ngăn cản ai làm gì)
4. Having become too dependent on the use of electricity, we have to find alternative sources of energy before fossil fuels run out.
5. Tonya was strongly criticised for having dumped a lot of rubbish on the beach.
(criticise + SO + for + V-ing)
học tốt
