Question 4. Since I left Vietnam six years ago, I _________ to visit friends and family several times.

A. will return  

B. have returned        

C. am returning

D. return

Question 5. She is never late _________ work.

A. from          

B. for  

C. to   

D. with

Question 6. Tom was unable to see anything, _________ he knew someone was in his room.

A. Although   

B. If   

C. Because     

D. In ease