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

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

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

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

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

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.

Minh used to _____ his homework late in the evening.