1/ 1.student will have to clean the school yard before the school year => the school yard_________________________________________________ 2.parents often make children study hard before exam =>children___________________________________________________________ 3.the last time we wrote to each other was last year =>we have_________________________________________________ 4.I am not a millionaire ,so I can't travel around the world => if I________________________________________________^.^ 5. the teacher will correct exercises tomorrow =>exercises____________________________________________ 6.they have just sent an ambulance to the school => an ambulance _____________________________________ 7.unless he phone immediately, he won't get any information =>if he_____________________________________________________ 8. no one is making efforts to protect our environment =>efforts_________________________________________________ 9.Trung is often late for school; therefore, he will be punished by his form teacher =>if trung ___________________________________________________________________________ 10. ba has planted these trees in the garden for a long time =>these trees____________________________________________________________