Joe won because he played ................ than Jane did

• D. better: "Better" is the correct choice as it is the comparative form of "good," which is used to compare how well Joe played compared to Jane.

The teacher spoke.............to help us to understand

• B. more slowly: The comparative form "more slowly" is used to describe the manner in which the teacher spoke, indicating it was done at a slower pace.

...................dance is a typical one of the Thai people in the North West ? - Mua xoe is

• D. What: "What" is used to ask for identification or description, which fits the context of identifying a type of dance.

.......................season in the year do Vietnamese people celebrate Tet ? - In spring

• C. What: "What" is used to ask about a specific season when Tet is celebrated.

.........................your grandmother like folk..........................?

• C. Does - music: "Does" is used with singular subjects, and "music" is uncountable, so no "s" is needed.

....................there 54 ethnic groups in Viet Nam ?

• A. Are: "Are" is used with plural subjects, which is appropriate here as we are talking about multiple ethnic groups.

Among mountainous regions in Viet Nam, ......................one will you want to travel to ?

• D. which: "Which" is used to select from among specific items, in this case, regions in Viet Nam.

.........................did you go with last year when you participated in the Hoa Ban festival ?

• A. Whom: "Whom" is used as the object of the preposition "with," referring to the person you went with.

We performed ...............in the contest than we did in practice

• C. worse: "Worse" is the correct comparative form of "bad," used to indicate the performance was poorer in the contest compared to practice.

After her poor test results, Jill did her homework ....................

• D. more frequently than: This option correctly uses the comparative form "more frequently" followed by "than" to compare the frequency of doing homework.

.................was your examination ? - I passed it with flying colors

• C. How: "How" is used to inquire about the manner or outcome of the examination.