.My dad usually________the subway to work, but today he goes to work________ bus.
A. by; by B. takes; by C. takes; on D. drives; by
—The doctor told me not to smoke too much, but I find it difficult.
—The doctor is right. _______ you smoke, _______ you will be.
A. The less; the healthier
B. The less; the more healthier
C. The more; the healthier
D. The more; the more healthier
Lots of practice is______ to improve our English.
A. the 
best way B. the best answer C. the right problem D. the right skill
The difficult problems make him __________
A. studying hard B. study hard C. to study hard D. studies hard
We still couldn’t decide _________ with our difficulties in learning English.
A.how to doB.how to deal
C.what to dealD.what to solve
We can’t do well in examination _________ we study hard in school time.
A. if B. and C. since D. unless
