2a effective

3a earns/will buy

4a important

5a tornado

6c Although

7c after

8a doesn't

9d taking

10a though

11 studied

12b were

13d B&C are correct

Task 2.1 We are studying sentences which contain relative clauses

2 Do you know any stores which sells English books?

3 Although the weather was not good, I went swimming

4 Even though Peter doesn't do much exercises, he is always in good shape

5 We had dinner at a restaurant which srved very good seafood

6 All the banks were closed because it was a national holiday

II.1 Yes,it is

2 One day

3 Mother's day in America in the secong day in May

4 Because people could show their love to their mothers

5 if they can not visit their mothers on Mother's Day, they will send them presents and call them on the phone

ℂ𝕙𝕠 𝕞𝕚̀𝕟𝕙 𝕩𝕚𝕟 𝟝* + 𝕔𝕒̉𝕞 𝕠̛𝕟 + 𝕔𝕒̂𝕦 𝕥𝕣𝕒̉ 𝕝𝕠̛̀𝕚 𝕙𝕒𝕪 𝕟𝕙𝕒̂́𝕥 𝕟𝕙𝕒 >~<

~ 𝓒𝓱𝓲𝓵𝓵 𝔀𝓲𝓽𝓱 𝓶𝓮 ~