Ahmad has impressed all the teachers with his ________ of American history.

• possibility

• knowledge

• target

• cure

This old building has some amazing ____________ to attract a huge number of tourists.

• side effects

• diseases

• experiments

• possibilities

Headaches are one __________________ of this drug.

• side effect

• mission

• advance

• procedure

No matter how good you are at shooting, it's very difficult to hit a moving ______________.

• procedure

• experiment

• cure

• target

My mother is ________________ about how little food I eat.

• concerned

• specific

• endangered

• invasive

She suffers from an usual heart _____________, so doctors are not sure how to treat it.

• disease

• possibility

• cure

• target

Getting a better chair completely _____________ my back problems.

• endangered

• cured

• concerned

• conducted

They collected money for a ______________ purpose, which was to help poor children in their area.

• concerned

• endangered

• invasive

• specific

The best learning ________________ are books, movies, or websites.

• missions

• experiments

• resources

• cures

The sea turtle is an ________ species. If we don’t do something to protect it, it may die out by 2050.

• invasive

• endangered

• emotional

• concerned