If I want to be an astronaut， how will I get to be one？
You do well in school and tame your fears．（ ）
A．mayB．canC．mustD．could
The teacher is glad to see that Tony is_______than before.（ ）
A．carefulB．more careful
C．most carefulD．the most careful
The doctors worked for ten hours，___________nobody took a break.（ ）
A．soB．forC．butD．or
—Sam，_________I join you in the community service？
—Of course you can.（ ）
A．canB．mustC．shouldD．need
—______shall we meet for the picnic？
—At the school gate.（ ）
A．HowB．WhenC．WhyD．Where
Space Day of China falls________ April 24th every year.（ ）
A．onB．byC．atD．in