【正文】
throw B. not throw C. to throw D not to throw 6. They watch the fish ________________ around A. swim B. swimming C. to swim D swimmer 7. He often encourages me ______________ hard A. to study B. study C. studying D. studies 8. After waiting for a long time , he finally let me __________ him A. see B. seeing C. to see D. seing 9. when I was young , mother often taught me __________ pictures A. draw B. to draw C. drawing D. drew 10 .They do a bird record ___________ the changes in their numbers A. study B. to study C. studying D. to studying Task4用所給動詞的適當(dāng)形式填空