Although these units are still very (3) ________, more and more people are buying solar hot water heaters.

Tìm từ có phần gạch chân phát âm khác với những từ còn lại.

If her condition should improve, we’ll inform you immediately.

=> Should ________________________________________________.

Canada is rich in _________ such as zinc, nickel, lead and gold.

________ his physical disability, he managed to finish the course with good results.