Some insects ________the colour of their surroundings to protect themselves

A. take on B. take in

C. take off D. take up

us to finish the work today and I’ll be pleased to go.

A. Join B. Joining

C. If you join D.To join

Once lost, _____________.

A. it is difficult to get such a chance again.

B. such a chance will never come again.

C. one can never get such a chance.

D. to get such a chance will be difficult.

The film star was surrounded by the audience ___________ he stepped off the stage.

A. at once B. the instant

C. now that D. at the moment

As we all know, the father __________ for the spoilt child.

A. is to blame B. is to be blamed

C. blamed D. blames on

Even the __________ doctor couldn’t cure him __________ his deadly disease.

A. experience; of B. experienced; of

C. experience; with D. experienced; with

---Why do you look so sad?

---There are so many problems_______.

A. remaining to settle B. remained settling

C. remaining to be settled D. remained to be settled

Please come to visit me if _________________.

A. you are convenient B. it is convenient of you

C. you are for convenience D. it is convenient for you

John rushed out in a hurry, _____ the door _____ .

A. leaving; unlocked B. leaving; unlocking

C. left; unlocked D. left; unlocking

Each time ______ they met, they would talk long hours together.

A. which B. when C. during D. /