Directions : There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentence and blacken the corresponding letter on the Answer Sheet. 6. Jonathan and Joe left the house to go for__ after supper.
A、walk
B、the walk
C、wallks
D、a walk
17. The president is to give a formal __ at the opening ceremony.
A、speech
B、debate
C、discussion
D、 argument
37.Why is debate important.
A、It helps people understand others better.
B、It allows people to present their opinions.
C、It develops one' s thinking and communicative competence.
D、It gives one the opportunity to brush others' opinion aside.