*. Choose the best answer A, B, C, or D to complete the sentences. 
1. Nam didn’t know …………………to find more information about the course.
A. what                       B. why               C. where                    D. while
2. He asked …………………it was too early to apply for the course.
A. if                           B for     C. while                      D. that
3. I couldn’t sleep last night …………………the bar nearby played music so loudly.
A. although                  B. so that     C. while                      D. because
4. …………………they moved to the city five years ago, they still remember living in a small town.
A. Although    B. Whereas   C. While        D. In order that
5. The students didn’t know …………………to do to deal with the problem.
A. where                B. when   C. why                    D. what
6. Lots of people choose to buy houses in the suburbs …………………they can avoid the noise and
pollution in the city. 
A. although            B. when     C. so that              D. so as
7. Minh is …………………the most successful student in my class.
A. so long            B. by how                        C. by far              D. so now
8. My grandfather is the …………………oldest artisan in the village; Ngoc’s grandfather is the oldest.
A. first                B. second                          C. most              D. one 
9. …………………I was talking to my teacher, my friends were waiting outside the classroom.
A. In order that             B. While                          C. Although             D. So that
10. Lan couldn’t decide …………………to work with on the project.
A who          B. what                                C. how        D. when