Chia động từ trong ngoặc của những câu điều kiện sau: If you (let) ... an object off your hand, it ... (fall)

ex1: Chia động từ trong ngoặc của những câu điều kiện sau
1. If you ( let) ................. an object off your hand, it ...........( fall )
2. If Tom ( not do )............ his homework, her teacher ( punish ) .......... him
3. Mr. Brown ( not refuse )..........if you (tell) ....... the truth
4. Unless we ( find )........ new sources of energy, we ( run )..... out of energy 
5. If it ( be) ....... rainy, the children (stay)......... at home
6. If it ( not be)........... cold,, we (go)....... out
7. They ( not go)......... to school if they ( be)........ sick
8. If she ( have)......... no money, she can't get home
9. You (be)...... late for class if you ( not start) .......... early
10. If the rice paddies are polluted, the rice plants .........( die)
11. What ....... they .......( achieve) if they work hard today
12. Plants ( die ).....if they don't get the sun
13. I am looking forward to ( hear)..... from you
14. I suggest ( travel)........ bby bus
15. Go with me and I ( show) ........ you my new car
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