【题目】I didn’t hear the doorbell because I ______ to music at that time.

【题目】—What color is it?

【题目】I ______ Mr. Li many times already. I’m sure he isn’t at home.

【题目】—Hi, Mary! Is that CD?

【题目】Sam ______ more progress if he works harder.

【题目】We can see__________ “u" and __________ “r” in “four”.

【题目】—What are the children doing in the park?

【题目】My parents often______ me some gifts on my birthday.

【题目】— ______shoes are these?

【题目】Jim and Jack ________ to Los Angeles in two days.