Rewrite each of the following sentences in another way so that it means almost the same as the sentence printed before it. Use the word or words in brackets where applicable. (Remember to write full sentences.)

38.Tim met his girlfriend during his stay in Vietnam last summer. (while)
Tim ____________________________________________________________________

39.You should not be late.
You’d better ______________________________________________

40.Sandy left the house, but first she locked the doors.
Before Sandy left _____________________________________________.

We haven't drunk milk tea for four months. (ago)
We last _____________________________________________.

Learning a second language takes time and patience.
It ______________________________________________________.

In the middle of our dinner there was a strange noise.
When we were ________________________________________