Chọn phương án đúng (ứng với A hoặc B, C, D) để hoàn thành mỗi câu sau:
1. Would you mind ________ the sentence aloud, please?
A. read B. reading C. be reading D. be read
2. Space travel may cost millions; ________, few people in the world can afford it.
A. however B. therefore C. because D. so
3. Dad asked the children ________his tie was.
A. where B. who C. that D. if