His eyes suddenly widened. I knew a good idea must have _________ to him.

Don’t worry. They’ll come to help us _______.[ ]

Was Tom a member of Greener China?—Yes, he has ___ Greener China for 5 years.

We will never forget those happiest days _______ we spent on the summer camp.

Seeing the happy of lovely children playing in the park, I’m full of joy and confidence in the future of our country.