we have collected used books for poor people___three years

a.for

b.since

c.at

d.in

students in our school ___their used books to poor children for four moths.

a.have donated

b.donated

c.will donated

d.donate

have you visited___interesting places?

a.some

b.a

c.much

d.any

Did he____ to teach English to street children yesterday?

a.started

b. has started

c. have started 

d. start

she____ small children in the neighbourhood since last month.

a. tutor

b.tutors

c.has tutored

d.tutored

can you give me___example, please?

A.any

B.an

Csome

D.a