10, The mother asked her son if he knew the effects of water contamination on their lives.
11, Mrs. Smith asked what sort of carpet I wanted to replace.
12, I asked the storekeeper what the price of that tie was.
13, She asked me where I was going on vacation.
14, He asked me how long I had studied English.
15, He asked me how many students there were in my school.
16, She asked him why he wanted the job.
17, Nam wanted to know what they needed to do to reduce noise pollution.
18, Tam’s friend asked him how long he would stay in England.
19, Tuan asked Ba why he had gone to the bank the day before.
20, He asked me how long I was waiting for the bus.
