Among the 15-year-old children, some ____ studying in university while others are still learning to read and write.

We tried our best to make our garden________its surroundings.[ ]

g onthe highway ______ be very dangerous, so you ______ be too careful

－Howmany women teachers are there in your school－_____of the teachers _____ women

It took us a long time ______Hawaii but wethought the journey was enjoyable.