David refused ______ his children to the weekend training center for extra classes.

(单选题)Math is compulsory for all students, while art and music are (单选题)—Where have you been?—I got caught in traffic. Otherwise I _ (单选题)—Could you tell me ______ the difficult problem, please?—Not (单选题)When people work with one mind they can even ______ Mount Ta (单选题)Great attention should be put to ______our environment from (单选题)______ it is to skate on real ice! (单选题)Try your best. They will choose a person ______ they think i (单选题)—Why didn’t you answer the phone just now?—I’m terribly sorr (单选题)I’m glad that my parents have ______ of me buying a new car. (单选题)Your bed needs ______, I am afraid.