—I’ll never forget the experiences ______ we had in the volunteer work last summer.
—Me too. The 3 days were meaningful and full of fun.
when
who
that
________ a walk is good for your health.
This tall building has _______ floors. And Tony lives on the ______ floor.
My bicycle doesn’t work. I’ll ask Uncle Wang __________.
—— Would you like ________ camping with me ? —— I’d like to. But I’m busy ______ my homework.
—— How does Jack usually go to school? —— He ________ ride a bike, but now he is used to ______ there.