If you’ve got a headache, why don’t you try _______an aspirin? 

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

Laos and Cambodia have big plans for building up to 11 ___________ on the lower Mekong. 

Minh used to _____ his homework late in the evening. 

When you save energy, you not only save money, you also reduce the demand for ___________ such as coal, oil, and natural gas and that is a great way to play a part in saving the planet.

Hurry up or we can't _________ the last bus home. 

___________ energy is produced by collecting sunlight and converting it into electricity. 

Public _________ in my town is good and cheap. 

In India, the demand for ___________ has always been more than the supply. 

Lan used to go to school _________.

I will see you again. We are all looking forward _______ again. 

If people _________ the rules, there are no more accidents. 

Instead of _______about the good news, Tom seemed to be indifferent. 

Those new students hope _______in the school’s sports activities. 

You should _________ right and left when you go across the roads.