The number of people in the city ______ about seven million now．（ ）
A．areB．hasC．is
School clubs are lively places where students are encouraged to _______ their interest．（ ）
A．developB．dependC．performD．overcome
___________the students came from different countries，they got on well in the camp．（ ）
A．WhenB．UnlessC．ThoughD．Until
Tina is pleased with the toy．It is ________ gift she has ever received．（ ）
A．a betterB．the betterC．a bestD．the best
I don't know when the bridge was built_______，but it must be very old．（ ）
A．exactlyB．carefullyC．luckilyD．easily
Ann grows up in a _______family．So she always feel happy when she gets home．（ ）
A．richB．strictC．lovingD．serious