106. English is not easy ____ (learn).

105. This is too difficult _____ (understand).

104. He must be very rich ___ (buy) that big house.

103. He lived ____ (see) his son a great man.

102. I´m sorry ____ (have) kept you waiting.

101. He works hard ____ (pass) the exam.

100. He was kind enough ____ (excuse) me.

99. I went there ____ (see) him.

98. He has no house ____ (live).

97. Give me some water ____ (drink).