Choose the correct answer A, B, C or D to complete Mi’s email to her friend, Liam

From: mi@fastmail.com
‎To: liam@quickmail.com
‎Subject: Changes in my village
‎Hi Liam,
‎How are you? I"m happy to share with you some good news about my village. There have been some changes (21)_____ your visit last year.
‎Last week I came back to my village and was really surprised. You know what? The lake is not (22)_____ anymore. The factory has installed a new filtration system to treat the (23)_____ waste. I saw lots of small fish in the lake and wild ducks swimming in the water. Besides, they have planted trees around the factory to (24)_____ air pollution.
‎What about your neighbourhood? Has anything been done to make it cleaner? Tell me all about it in your next email.
‎Bye for now,
‎Mi

fall

rise

reduce

increase

Choose the correct answer A, B, C or D to complete Mi’s email to her friend, Liam

From: mi@fastmail.com
‎To: liam@quickmail.com
‎Subject: Changes in my village
‎Hi Liam,
‎How are you? I"m happy to share with you some good news about my village. There have been some changes (21)_____ your visit last year.
‎Last week I came back to my village and was really surprised. You know what? The lake is not (22)_____ anymore. The factory has installed a new filtration system to treat the (23)_____ waste. I saw lots of small fish in the lake and wild ducks swimming in the water. Besides, they have planted trees around the factory to (24)_____ air pollution.
‎What about your neighbourhood? Has anything been done to make it cleaner? Tell me all about it in your next email.
‎Bye for now,
‎Mi

for

since

after

.before