【题目】The rain stopped and the sun ______.

【题目】She looks beautiful ______ she is not young.

【题目】I'm waiting for my friend.______，I'll go shopping alone.

【题目】Don't cut down the trees ______ the butterflies need to rest on.

【题目】There are many mysteries to ______ by scientists.

【题目】All the butterflies have left ______ the north in spring.

【题目】The exciting thing has ______ these boys' attention.

【题目】Our teacher often encourages us ______ hard.

【题目】It's interesting ____ experiments in class.

【题目】—Shall we go for a walk?