1.I forget what I was taught , I onlyremember what I _________
A. learn
B. learned
C. havelearned
D. had learned
2. My younger sister ______the Youth League______2006
A.has joined ; in
B. hasjoined ; since
C. hasjoined ; since
D. joined; in
3.They_______friends since they met in New York
A. havemade
B. havebecome
C. havebeen
D. haveturned
4.Nobody but the twins_________someinterest in the project till now
A. shows
B. show
C. haveshown
D.hasshow