Because of the terrible earthquake, some people became homeless and they had to ________the tents for the night.

We’ll stay at home if it ______ this afternoon.

.Bay, Amazon and Wall Mart are popular websites ______ people can sell goods to each other.

There are many tall trees _____ the two buildings. [ ]

Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.