.............. she was very tired, she helped her brother with his homework

Choose the best answers
1) .............. she was very tired, she helped her brother with his homework. 
A. Because
B. whether
C. Although
D. so
2) It’s raining hard, ............... we can’t go to the beach. 
A. or
B. but
C. so
D. though
3) Nam was absent from class yesterday .............. he felt sick. 
A. so
B. because
C. although
D. but
4) Tom has a computer, .............. he doesn’t use it. 
A. or
B. as
C. because
D. but
5) The boy can’t reach the shelf ........... he’s not tall enough. 
A. because
B. although
C. even though
D. and
6) The film was boring, ............. we went home. 
A. so
B. when
C. but
D. if
7) The girl bought the shoes ............ they are very expensive. 
A. but
B. if
C. so
D. although
8) He used to smoke a lot ............ now he doesn’t smoke any more. 
A. still
B. therefore
C. but
D. as
9) She couldn’t unlock it ............. she had the wrong key. 
A. while
B. but
C. though
D. because
10) ................. it rained, the boys played football. 
A. Even
B. Even though
C. However
D. In spite of