[单项选择]We could not have fulfilled the task in time if it （） for their help.
A. was not
B. is not
C. had not been
D. has not been

[单项选择]We could not have fulfilled the task in time if it _______for their help.
A. was not
B. is not
C. had not been
D. has not been

[单项选择] I could not have fulfilled the task in time if it _____ for your help.
A. was not
B. had not been
C. had been
D. has been

[单项选择]We have no time to lose. Let's ______ on the task before us.
A. enter
B. impose
C. concentrate
D. overwork

[单项选择]Roger: Hurry up! We don't have much time left. Dick: ______. We still have two hours. Roger: Come on! This is my first time ever to take a plane. I don't want anything to go wrong.
A. Go on
B. Take it easy
C. All right
D. Look out

[单项选择]Roger: Hurry up! We don't have much time left.Dick: ______. We still have two hours.Roger: Come on! This is my first time ever to take a plane. I don't want anything to go wrong.
A. Go on
B. Take it easy
C. All right
D. Look out

[单项选择]It's time to have class. We had better ______ and ______ to the teacher.
A. stop talking... listen
B. to stop talking... listen
C. stop talking... to listen
D. to stop talking... to listen

[单项选择]We don't have much time ______; I will end my lecture in a minute.
A. remained
B. kept
C. left
D. found

[单项选择]We don't have much time __________ ; I will end my lecture in minute.
A. remained
B. left
C. kept
D. found

[单项选择]We have done all we could and now our cherished project is at the mercy of our new CEO.
A. under the guidance of
B. in the power of
C. on the verge of
D. on the agenda of

[单项选择]

We all have offensive breath at one time or another. In most cases, offensive breath emanates from bacteria in the mouth, although there are other, more surprising causes.
Until a few years ago, the most doctors could do was to counsel patients with bad breath about oral cleanliness. Now they are finding new ways to treat the usually curable condition.
Bad breath can happen whenever the normal flow of saliva (唾液) slows. Our mouths are full of bacteria feeding on protein in bits of food and shed tissue. The bacteria emit evil-smelling gases, the worst of which is hydrogen sulfide (硫化物).
Mouth bacteria thrive in airless conditions. Oxygen-rich saliva keeps their numbers down. When we sleep, for example, the saliva stream slows, and sulfur-producing bacteria gain the upper hand, producing classic" morning breath".
Alcohol, hunger, too much talking, breathing through the mouth during exercise -- anything that dries the mouth produces bad brea
A. Tooth trouble.
B. Sulfur-rich food.
C. Too much exercise.
D. Mental strain.