3 . Alice received an invitation from her boss, __________ came as a surprise.
A.it | B.that | C.which | D.who |
4 . You can find whatever you need at the shopping centre, __________ is always busy at the weekend.
A.that | B.where | C.what | D.which |
5 . In this case, cool evening air is a slightly different temperature than the solar cell in the panel. That becomes energy,
6 . Some live in remote parts of South America,
A.who | B.that | C.where | D.which |
A.where | B.which | C.in which | D.what |