Are you sure thedelegation will come to our school next week—____________Thehead of it has just emailed me about the departure time of their flight

tronaut did many experiments in the spaceship, ______much help for knowing space.

It has been laid down that each student must _____ a composition to the teacher once a week.

Hong Kong _______ 31st on a 2009 livability survey of world’s 140 cities by Economist magazine, the best performance among nine Chinese cities that edged into the list, the China News Agency citing a news report said.

We won’t go back home ___ the rain stops. We now have to stay in the classroom.