1. sabes
2. the launch, mission, and landing
3. to research the earth's Ozone
1: p
2:I
3:p
4:p
5: I
6:p
7:I
8: I
The right answer is A. Cuando Carlos y Sofìa estuvieron en Costa Rica, viajaron en tren varias veces.
This means: <span>When Carlos and Sofía were in Costa Rica, they traveled by train several times.
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The keywords are "estuvieron" (were), that<span> is the past of "estar". And the "viajaron" (traveled), that is the past of "viajar" (Travel). </span><span>In the other sentences, the past is not well conjugated.
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<span /><span>I hope this information can help you.</span>
The URL (Uniform Resource Locator)
