They found _____ useful to advertise on the Internet.
| A．that | B．this |
| C．it | D．it is |
-How much did you ____ on your new bike ?
-About two hundred Yuan.
| A．spend | B．pay |
| C．cost | D．take |
Do you know _____ during the following summer holiday ?
| A．what will Tom do | B．what did Tom do |
| C．what Tom will do | D．what Tom did |
Miss Li__________ more than 100 books in the last few years.
A. read B.has read C. has been reading
My pen-pal Andrew found ______difficult to learn Chinese well.
A. /B. that C. it