b2:1.playing          2.will visit        3.are going to have          4.does that farmer introduce     5.are wasting

b3:1.a->will           2.c->programmes      3.a->has           4.b->will have        5.b->might go

b4:1.c        2.c            3.b        4.c          5.b

b5: 1.the blue clock is older than the red one/red clock

2.the Fansipan is the highest mountain in viet nam

3.sydney street is shorter than oxford street

4.this is the first time i have ever visited a beatiful sight

5.my sister will be eighteen next week

*

1.c           2.d          3.b        4.d       5.a             6.b         7.b          8.a          9.d     10.b       11.a     12.d       13.c     14.a    15.b