--Who did you ___ in the street last Sunday?---Lin Tao, a good friend of mine.

A. run away    B. run for   C. run into    D. run after

I can’t find my English book. I must ___ it at home this morning.

A. forget    B. leave   C. have forgotten   D. have left

Today our lives are getting ___.

A. more good    B. better   C. better and better    D. more better

Hangzhou is one of the most beautiful cities ___ I have ever visited.

A. that   B.which   C. it    D. where