Câu hỏi:

I'm afraid that I won't come to your house tomorrow.

 ___________ can be an excellent source of free, renewable energy for poor farmers.

Will nuclear energy used by many countries in the world?

I hope the storm won't be destroyed many buildings in the city.

There are many available ___________ power sources in Vietnam including sun, wind, water, etc.

When will the non-renewable energy sources be use up?

The result of the exam will announce in June.