23. They often went to school by bike when they were young.

A. They used go to school by bike when they were young.

B. They used to going to school by bike when they were young.

C. They used to go to school by bike when they were young.
D. They used to went to school by bike when they were young.

24. She has taught her children to play piano for 4 years.

A. She started teaching her children to play piano 4 years ago.

B. She started to teaching her children to play piano 4 years ago.

C. She started teaching her children to play piano for 4 years ago.

D. She started teaching her children to play piano since 4 years.

25. It's a pity I can't cook as well as my mom.

A. I wish I could cook as well as my mom.

B. I wish I can cook as well as my mom.

C. I wish I could cook as good as my mom.

D. I wish I can cook as better as my mom.

26. Shall we use environmental problem in Ha Noi as a theme of the presentation?

A. She suggests use environmental problem in Ha Noi as a theme of the presentation.

B. She suggests to use environmental problem in Ha Noi as a theme of the presentation.

C. She suggests to using environmental problem in Ha Noi as a theme of the presentation.

D. She suggests using environmental problem in Ha Noi as a theme of the presentation.