Do I have to speak a foreign language to be accepted?

It depends on the country you select.

The program is cultural and academic in nature. Generally it lasts an academic year and requires that students attend the local high school which usually teaches in the foreign language. The need for a working knowledge or proficiency in the language varies depending on the country. For example, in India and the Philippines, schools teach in English.

Some countries provide language courses to newly accepted exchange students for a modest fee. Generally it is important that you should get a basic knowledge of your host country, prior to departure.