Although it has rained heavily all the morning, the kids ________having P.E. classes on the playground because they will have an exam soon.
There ______ a football match next week.
While I ________to the programs, my mother ________outside.
It ______ the workers about 20 months to build the Huhang highspeed railway.
Of all the students, Li Lei is _______to Mr Wang.
There are a lot of _______friends.