_____is too hard _____ a good solution to this problem.

Will you drop ________ us tomorrow evening for a talk?—Sounds great! [ ]

________ we go swimming in Xishuanghu Lake today? —- Oh, no. It’s ________ cold to swim on such days. I will catch a cold.

_____ March 28, about 20 Chinese cities turned off lights of major building for one hour. [ ]

It’s very kind of you to so much time showing me around your school.