1. If you ( let) .....let ............ an object off your hand, it ....will fall.......( fall )
2. If Tom ( not do )...doean't do......... his homework, her teacher ( punish ) ....will punish...... him
3. Mr. Brown ( not refuse )...won't refuse.......if you (tell) tell ....... the truth
4. Unless we ( find )..find...... new sources of energy, we ( run )..will run... out of energy
5. If it ( be) ...is.... rainy, the children (stay)....will stay..... at home
6. If it ( not be)...isn't ........ cold,, we (go)...will go.... out
7. They ( not go)...won't go...... to school if they ( be)..are...... sick
8. If she ( have)....has..... no money, she can't get home
9. You (be).will be..... late for class if you ( not start) ....don't start...... early
10. If the rice paddies are polluted, the rice plants ...will die......( die)
11. What ..will ..... they ..achieve.....( achieve) if they work hard today
12. Plants ( die ) will die.....if they don't get the sun
13. I am looking forward to ( hear).hearing.... from you
14. I suggest ( travel)....travelling.... bby bus
15. Go with me and I ( show) ..will show...... you my new car