1. If he _____ (listen) to me, he would have got the job.

2. The tree was dead because it _____ (be) arid all summer.

3. I _____ (meet) him somewhere before.

4. Linh told me she _____ (study) a lot before the exam.

Viết phương trình điện li của H₂SO₃.

Mình nha. phannguyenhoangvinhthcs@gmail.com