Read the following announcement and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks.

STUDENT EXCHANGE PROGRAM

Our school is organizing a cultural exchange program in the UK this summer. Students will stay with host families for two weeks and take part in cultural activities and school visits. In previous programs, our students made a great (18) ________ on their host families thanks to their friendliness and active participation.

Students joining the trip should maintain a healthy lifestyle: eat well, exercise regularly, and (19) ________ enough sleep. They should also prepare carefully (20) ________ they can communicate confidently with their host families.