Could you tell me ________？

         A.when leaving     B.when to leave  

         C.when leave       D.when left

The missing boys were last seen________near the river.

A.to playing  B.to be playing    C.play    D.to play

Paul doesn't have to be made________.He always works hard.

A.learn   B.to learn    C.learned    D.learning

It took my daughter two weeks________ the novel written by Lu Xun.

A.read  B.to read     C.reading    D.to reading

We often heard her ________ in the morning.

        A.sings     B.sing   C.sang      D.to sing

It's important for us ________ it well and quickly.

        A.learning     B.learnt   C.for learning       D.to learn

Do you know ________ to send the letter?

A.how go     B.where to go  C.what to go      D.where going

—Mr.Wang, I have trouble________the text.

—Remember________it three times at least.

A.to understand; reading  B.understanding; reading

C.understanding; to read  D.understand; to read

Mary and I enjoy________badminton.

A.to play   B.playing    C.played    D.to be played

In fact, I don't mind you ________ these books.

        A.taking       B.took      C.to take     D.taken