Something must be done to stop air pollution, ________ we will have no fresh air.
A. or
B. for
C. but
D. so
The newspaper says house prices in Australia are expected ________ by 10% in 2017.
A. rise
B. rising
C. to rise
D. to rising
According to a recent survey, Google Play is one of ________ apps in the world.
A. popular
B. more popular
C. most popular
D. the most popular
It’s important for a teacher to express ________ clearly in class.
A. he
B. him
C. his
D. himself
The waiter was asked to welcome guests with a ________ smile and a bow.
A. friendly
B. kindly
C. politely
D. happily
Benjamin was born in Boston ________ the morning of January 17, 1907.
A. in
B. on
C. at
D. by
