I/
1/ Huyen My doesn't sing as beautifully as her sister.
2/ The new sculpture isn't as high as the old sculpture.
3/ Linh likes pop music. Her brother likes pop music, too.
4/ Van Gogh's nationality is different from Picasso.
II/
1/ has been used
2/ was discovered
3/ has been widened
4/ was built
5/ visited
VII/
1/ Exercises are often done every night.
2/ The room is usually decorated at weekends.
3/ Country songs are always sung by Daisy.
4/ Her sister is often given sweets.
5/ These trees are often watered by Nam and Peter.
VIII/
1/ Did you use to enjoy
2/ didn't use to like
3/ used to be
4/ Did John use to work
5/ didn't use to be