( )1. I don’t know ________ my uncle will come tomorrow. ________ he comes, I’ll call you.
A. if; Because B. whether; Before
C. if; That D. if; If
( )2. Your Chinese teacher is a young lady ________ comes from Beijing.
A. who B. which C. whom D. whose
( )3. We were having dinner ________ a stranger came in yesterday.
A. when B. before C. after D. while
( )4. The beautiful girl ________ we met yesterday is Jim’s sister.
A. which B. what C. who D. whose
