Because vehicles using fossil fuels cause pollution, scientists wants to find a cheaper and.................................replacement.

• inconvenient

• dangerous

• polluted

• eco-friendly

Wind is renewable source of energy because i can be easily...................................

• converted

• changed

• removed

• replaced

Let's go to the cinema tonight?

.....................................I have a lot of homework to do.

• Yes, let's

• Great idea.

• I'd love to, but

• That's Ok

Many countries in the world...........................................wind power on commercial basis today.

• used

• will use

• are using

• uses

Although nuclear power is clean and plentiful, it is not.............................

• dangerous

• safe

• unsafe

• renewed

solar energy can be changed into..................................

• electricity

• electric

• electrician

• electrical

Do Vietnamese people celebrate Independence day .............................Septemper ?

• in

• on

• at

• of

..................................the music festival great last Sunday?

• Were

• Did

• Was

• Is

Now, we................................cheap, clean source of energy.

• look

• are looking

• looks

• is looking

Children love painting eggs at................................

• thanksgiving

• Tet

• Easter

• Christmas