— We’ll visit the Summer Palace__________ there is a heavy rain tomorrow.
— OK! Boating on the lake must be great fun.
A. unless B. since
C. until D. if
_________ is known to all is that the earth is smaller than the sun.
A. As B. What
C. It D. Which
We are going to spend the Spring festival in Guangzhou, _____ live my grandparents and some relatives.
A. which B. that
C. where D. who
He is a man of great experience, _____ much can be learned.
A. who B. that
C. from which D. from whom
Jack is a dishonest boy. He always ______ some excuses for doing something wrong.
A. picks up B. gives up
C. takes up D. makes up
In order to find the missing child, villagers _____ all they can over the past five hours.
A. did B. do
C. had done D. have been doing
