He______be in the classroom，I think．
No，he____be in the classroom．I saw him go home a minute ago．（ ）
A．can； may notB．must； may not
C．may； mustn'tD．may； can't
The designer has tried every possible way to make the robot light， so you _____ worry about its weight．（ ）
A．mustB．mayC．can'tD．needn't
On sunny days， my grandma often reads a novel ____ the window．（ ）
A．byB．forC．withD．from
﹣Hello， Beijing Hotel． Can I help you？
﹣Yes， I'd like to _____ a single room for two nights．（ ）
A．enterB．moveC．bookD．provide
A better future is the goal of the Chinese people， _____ it's also the common interest of the world．（ ）
A．soB．andC．orD．but
﹣The 5G technology can help doctors treat patients who are hundreds of kilometers away．
﹣ It's really ____．（ ）
A．secretB．direct
C．amazingD．traditional