Some students think it's hard      __     American accents.
[     ]
A. to understood  
B. understand
C. understood
D. understanding
Which of these do you think is the best way            your  listening?
[     ]
A .improve
B. improves
C. to improve
D. improving
Try             you  homework on time, or you'll  fall behind. 
[     ]
A. to finish
B. finish
C. finishes
D. finished
You need _____ your classroom every day.
[     ]
A. to clean
B. clean
C. cleaning
D. to cleaning
 0  15405  15413  15419  15423  15429  15431  15435  15441  15443  15449  15455  15459  15461  15465  15471  15473  15479  15483  15485  15489  15491  15495  15497  15499  15500  15501  15503  15504  15505  15507  15509  15513  15515  15519  15521  15525  15531  15533  15539  15543  15545  15549  15555  15561  15563  15569  15573  15575  15581  15585  15591  15599  159627