Mr. Wang is ill, so we must ____ a new teacher to the school to take his place.
In many places in China,_____ bicycle is still _____ popular means of transportation.
-----Hello, Jessica! What happened?----- I could not hear you clearly because my mobile phone could not receive a good ________.
Every boy and every girl in our school _____ to join one or two clubs according to their hobbies.
I saw a lighthouse _____ at the mouth of the river.
---Tom. answer my question.---Oh, sorry, ______. I beg your pardon?