1) It took them two hours to walk to the picnic site .
—–> They ….
2) we need to repair our house before the storm.
—> Our house needs ….
3) Do few students learn Russian nowdays ?
—->Few students….
4) The river is too dirty for us to swim in.
—-> Because
1. They spend two hours walking to the picnic site.
2. Our house needs to be repaired before the storm.
3. Few students learn Russian nowdays, don’t they ?
4. Because the river is too dirty, we can’t swim in.