The answer can be both which and whose
because which could be used when one is selecting
an object among various objects, which is applicable here.
As for whose, Tom could be choosing from a few friends'
cars. Therefore, both options are applicable.
Most teachers do not encourage pupils to use
those conjuctions for comprehenision as pupils
often tend tomake grammatical errors in their answers.
Putting "Because" at the start of each sentence would not be wise
as the pupil would need a complete sentence. "But" would
usually not be necessary. It would be unusual to begin a sentence
with "but". Likewise for "As", except for in special cases:
eg. As John had already crossed the bridge, he was not injured.
However, it would be better to put it as: John had already crossed the bridge, and therefore, he was not injured.
I hope you find this useful.
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