Use the correct tense or form of the verb in parentheses:
91. I think we ................... some canned food before typhoon. (buy)
98. Road users ............... by law to wear quality safety helmets. (force)
99. Please wait right here until Katie ................ back. (come)
102. They are the first customers .................. and .................... things in the shop. (come / buy)
103. Do you have difficulty .................... a job after................... ? (find/ graduate)
104. It was impossible to use fire-fighting equipment because most of the water pipes ........... before. (burst)
106. I like reading books .................. about different people and their cultures. (tell)
107. I saw an accident while I ............... for a bus at a bus stop. (wait)
108. Tuan .................. as the most effective activist in the charity program. (just/ nominate)
112. We 'll bring along raincoats in case it .............. (rain)
114. He is the last student ............ the classroom. (leave)
116. Where is the magazine I gave you? What .............. with it? (you/ do)
117. I think I hear someone ............... to open the back window. (try)
118. She couldn't go with them because she was busy ............... on the exam next time. (work)
B.
4. It's time you ................. for the party tonight. (prepare)
6. He started ............ the guitar when he was five. (play)
13. The audience was made............. by the funny clown. (laugh)
14. Not until 1995 .............. on Tien River. (a bridge/ build)
15. After the recess, our teacher went on................... the lesson. (explain)
16. Do you have any difficulty ............. English? (study)
20. Our teacher said that she ................... us the following day. (examine)