Ninety-six point five percent of the water on the earth ______ sea water.
| A．are | B．is | C．was | D．were |
Thorough
| A．northern | B．Thrill | C．though | D．without |
— You shall get an iPad so long as you come first in the speech contest.
— Is that a ________? Don’t let me down, I hope.
| A．trick | B．decision | C．promise | D．goal |
With a population of over seven million, London is ________ the largest cities of the world.
| A．between | B．among | C．from | D．of |
— I rang you up last night, but nobody answered.
— Oh, I usually ________ off my phone at about 9:00 p.m.
| A．switched | B．have switched |
| C．switch | D．had switched |
There are two rooms in the apartment, ________ serves as a kitchen.
| A．the smaller of them | B．the smallest of which |
| C．the smaller of which | D．smallest of which |