单句语法填空
1．Words failed ___________ (convey) my feelings the moment I saw my longlost sister.
答案：to convey
2．With several problems remaining ___________ (solve), we still needed to hold another meeting as soon as possible.
答案：to solve
3．Jack had no confidence and courage at that time. That was the reason ___________ he gave up the plan.
答案：why
4．Some students feel that ___________ (exchange) gifts can make more friends and expand their network of friends.
答案：exchanging
5．It is a surprise that the faraway village has been transformed ___________ a famous tourist city in only ten
