We can’t fix this machine well. Can you show us ___?
A. how to do B. what to do it C. how to do it D. where to do
Did you see them ____ basketball this morning?
A. playing B. were playing C. to play D. are playing
He didn’t study hard, so he was afraid ______ in the exam.
A. fail B. to fail C. failing D. failed
I had some problems _____ my homework.
A. to finish B. finishing C. finishes D. finish
Can you learn English ________ chatting on the Internet?
A. in B. with C. by D. for
He thinks _____ history about Chinese is very important.
A. studied B. studying C. studies D. study
