Answer:
it's the third one
Explanation:
because in the passage it says he is not here that should sing it and the third one says the man who should sing isn't here right now
<span>1. Which is the tense of the underlined verb? Running against much older athletes, Billy (had placed) second!
A. past
B. past perfect
C. past progressive
D. present perfect
</span><span>2. Which is the tense of the underlined verb?
We (have been thinking) of putting up another fence.
A. past progressive
B. present perfect progressive
C. past perfect progressive
D. present progressive
</span><span>3. Which is the tense of the underlined verb?
It (was disappointing) when we realized we couldn't go.
A. past progressive
B. past perfect progressive
C. present progressive
D. present perfect progressive
4. Which is the tense of the underlined verb?
She (had been writing) poetry but thought her ideas would work better as a novel.
A. present progressive
B. past progressive
C. past perfect progressive
D. present perfect progressive</span>
Answer: The greenhouse effect is an ecosystem service which warms the Earth to temperatures which support life.
Explanation: The greenhouse effect involves water, carbon dioxide, methane, and ozone, which absorb heat that would otherwise be radiated out into space.
YW!!! <3 :]