4. cleaning/To/people/ for/ their/ spend time/ houses/ prepare/ Tet/ often/for.
A. To prepare for Tet, people often spend time cleaning their house.
B. To prepare for Tet, people often spend time their house cleaning.
C. To spend for Tet, people often prepare time their house cleaning.
D. To spend for Tet, people often prepare time cleaning their house.
5. have to/go/ We/to/ at Tet/ don't/school.
A. We don't to go have to school at Tet.
B. We don't go to have to school at Tet.
C. We don't have to go to school at Tet.
D. We don't have to school go to at Tet.
6. higher/ building/ This/ that/is/than/ one.
A. This is building higher than that one.
B. This building is higher than that one.
C. This building is one than higher that.
D. This building is that one higher than.