To help Tom improve his English, I_______ that he take some online courses.
Scientists warn us _____ the need to keep an eye ____ the greenhouse effect.
The old temple, which ______ to the 17th century, needs to be repaired.
---Who do you think should ____ the responsibility for white pollution? --- Both the producer and the consumer.
I would rather you _____ the truth now instead of afterwards.
The police came here in the hope ___ they could learn about the cause of the traffic accident.