Don’t come into the lab ________ you are asked to.
| A．unless | B．until | C．because | D．since |
He had to stay at home _____________the heavy rain.
A because B since C because of D so
I found _________difficult to work out the problem.
A it’s B this C that D it
They ________________for a year.
A have borrowed the books B have gone to
C have left home D have been in Japan
They have _________ many friends that they are ___________happy.
A such, so B so, such C so, so D such, such
The room is ________small for us ____________live in..
A so, that B such, that C enough, to D too, to