21. －shelly was late for the oral class this morning.
－ ________? as far as i know, he never came late to class.
a. how come b. so what c. why not d. what for
22. shall we take ________ short break? i want to make ________ call.
a. the；a b. a；the c. the；the d. a；a
23. -- will you two go to the exhibition tomorrow?
-- no. we're going shopping. ________ at least i'm planning to.
a. and b. or c. but d. so
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