—What a lovely present!Who sent it? __________it be your brother?
—It __________be my brother. He doesn't know today is my birthday.
句意：——多可爱的礼物啊！谁送的？会是你哥哥吗？——不可能是我哥哥。他不知道今天是我的生日。
考查情态动词。Can可能；Must一定；can't不可能；mustn't表禁止。由“Who sent it?”可知，此处应为不知道谁送的礼物，所以应用情态动词can“可能”引导疑问句表推测；由“He doesn't know todayis my birthday”可知，哥哥不知道我的生日，所以这不可能是他送的，故应用情态动词can't表不可能。故选A。
—What a lovely present!Who sent it? __________it be your brother?
—It __________be my brother. He doesn't know today is my birthday.
—Excuse me, are the glasses Mike’s?
—No, they __________be Mike’s. He doesn’t wear glasses.
— Is that man your friend Tom?
—That man ________ be him,because he has gone to Canada.
—Sam, ________ I join you in the community service?
—Of course you can.
________you smell something burning? Go and see what's happening.
下面四个交通标志图是轴对称图形的是（ ）
—Could you hang out with me, Kate?
—Sorry, I ________. I have to do my homework.
“天问一号”在经历了7个月的“奔火”之旅和3个月的“环火”探测，完成了长达5亿千米的行程，登陆器“祝融”号火星车于2021年5月15日7时18分从火星发来“短信”，标志着我国首次火星登陆任务圆满成功，请将5亿这个数用科学记数法表示为（ ）
We ________ see which way to go if the stars do not twinkle（闪耀）so.
