Combine the sentences using relative clauses. (cẩn thận những câu là "Non-defining relative clauses" thì nhớ phải thêm dấu phẩy):
LƯU Ý: NHÌN KỸ ĐỀ RỒI MỚI TRẢ LỜI! TUYỆT ĐỐI KHÔNG COPY MẠNG VÌ CÂU HỎI CỦA MÌNH CÓ THỂ HƠI KHÁC!
16. The singer had to cancel her concert. She was recovering from flu.
->................................................................
17. The doctor is not here today. You spoke to him yesterday.
->................................................................
16 The singer who was recovering from flu had to cancel her concert.
17 The doctor to whom you spoke yesterday is not here today.