Will Mr Brown come to visit the company ?—We don’t know if he _______．If he ______，we’ll tell you．

Tomorrow we are going to Xixi National Wetland Park. Let’s____at the gate on Wensan Road.

____should I clean out the refrigerator?—Twice a week.[ ]

There is ______ “f” and ______”u” in the word “four”.

I wanted to know _____________.