— Is Tom at school today?

— No, he is at home ______ he has got a bad cold.

“Is Tom at school today?”“No. He's at home ________ he has a bad cold.”

1. A.
   because
2. B.
   if
3. C.
   until
4. D.
   before

---Is Tom at school today?

---No. He’s at home ______ he has a bad cold.

1. A.
   because
2. B.
   of
3. C.
   until
4. D.
   before

-Is David at school today?

-No．He is at home ________ he has a bad cold．

1. A.
   because
2. B.
   if
3. C.
   though
4. D.
   until