Qian Xuesen （consider） as "Father of Missile（导弹）in China"．
Our earth is becoming more and more （pollute） because of the rapid increase in population．
I （not finish） my homework yet． I am afraid I can't go to the park with you．
Can I help you， sir？
A box of （tomato）， please．
Why are you in such a hurry， Cathy？
My dad and mum don't （let someone do something） me to stay out late．