2 sentences

1. 他在这次选举中被选为候补委员。

   tā zài zhè cì xuǎn​jǔ zhōng bèi xuǎn wéi hòu​bǔ wěi​yuán.

   He was elected as an alternate member in this election.

   Source: Dong Chinese Dictionary

2. 他正在等候补这张已经售罄的机票。

   tā zhèng​zài děng hòu​bǔ zhè zhāng yǐ​jīng shòu​qìng de jī​piào.

   He is waiting for a standby seat for this sold-out flight.

   Source: Dong Chinese Dictionary