U.S. presidents normally serve a(n)（）term.

单项选择题（）is the capital of Canada.

A.Vancouver
B.Ottawa
C.Montreal
D.York

单项选择题Dina,（）for months to find a job as a waitress, finally took a position at a local advertising agency.

A. struggling
B. struggled
C. having struggled
D. to struggle

单项选择题John's success has nothing to do with good luck. It is years of hard work（）has made him what he is today.

A. why
B. when
C. which
D. that

单项选择题This coastal area（）a national wildlife reserve last year.

A. was named
B. named
C. is named
D. names

单项选择题You（）buy a gift, but you can if you want to.

A. must
B. mustn't
C. have to
D. don't have to

单项选择题Father（）goes to the gym with us although he dislikes going there.

A. hardly
B. seldom
C. sometimes
D. never

单项选择题Listen! Do you hear someone（）for help

A. calling
B. call
C. to call
D. called

单项选择题Being a parent is not always easy, and being the parent of a child with special needs often carries with（）extra stress.

A. it
B. them
C. one
D. him

单项选择题（）twice, the postman refused to deliver our letters unless we chained our dog.

A. Being bitten
B. Bitten
C. Having bitten
D. To be bitten

单项选择题The biggest whale is（）blue whale, which grows to be about 29 meters long—the height of（）9-storey building.

A.the；the
B.a；a
C.a；the
D.the；a