I find ______ difficult to finish the work all by myself.A. it B. that C. this
Please remember ___________ the letter for me on your way to the supermarket. A. to post B. post C. posting
You look exhausted. What happened ___________ you? A. on B. with C. to
The doctor said he was overweight and should pay attention ___________ exercise. A. to do B. to doing C. do
You can’t take away things that ___________ you. A. aren’t belong to B. don’t belong C. don’t belong to
–___________ do you visit your grandparents? –Twice a month. A. How long B. How soon C. How often