17.??Magnesium has a specific gravity of 1.74, which means that ___ 1.74 times as much as an equal volume of water. A. it is weighed B. weighing it C. its weight D. it weighs ...

12.?? The medicine the doctor gave him ___ his headache. A. freed B. refreshed C. released D. relieved ...

7.?? If you want to get to Shanghai by tonight, you have no ___ but to go by plane. A. alteration B. alternative C. alternate D. altercation ...

2.?? On Sundays she usually does some ___ in ___. A. shopping/ big shop B. shopping/big shoppings C. shoppings/big shops D. shopping/big shops ...

16.??Polar explorers have to be extremely___to endure the climate and other hardships. A. tough B. hard C. rough D. brave ...

11.??The neighbors do not consider him quite___as most evenings he awakens them with his drunken singing. A. respectful B. respectable C. respected D. respective ...

6.??He insisted that we___him the news. A. told B. informed C. helped D. tell ...

1.??She is___of his innocence. A. believed B. trust C. persuaded D. convinced ...

21.??The river___its name from an Indian chief. A. calls B. gets C. derives D. has ...

16.??It＇s a surprise that we___invited to the party. A. are B. were C. be D. have been ...