1) Complete the following sentences in the PAST PERFECT TENSE.

1) She ____ ________ (to write) six letters before she got a response.

2) It ____ always ______ (to snow) here before 1978.

3) Dan ____ ______ (to be) sick for three days before he got better

4) Li and Susan _____ ______ (to try) four times before they gave up.

5) My father's old car ____ ______ (to run) very well before he sold it.

6) We not ____ ______ (to take) the test before

7) My uncle _____ ______ (to visit) China several times in the past, so this visit was nothing new.

8) Our father ____ never ______ to drive) to California.

9) I ____ _______ (to speak) to the president twice before, so I was not that nervous.

10) The old man _____ occasionally _____ (to need) help crossing the street. ​