He kept in touch to his old friends.

A:kept B:in C:touch D:to

He (kept) his (head); (otherwise) the accident (had happened).

A:kept B:head C:otherwise D:had happened

______ the room temperature, she kept the heater on.

A:Kept on B:Keeping up C:So as to keep up D:To keep up

He (kept) his (head); (otherwise) the accident (had happened).

A:kept B:head C:otherwise D:had happened

（）the room temperature, she kept the heater on.

A:Kept on B:Keeping up C:So as to keep up D:To keep up

He (kept) his (head); (otherwise) the accident (had happened).

A:kept B:head C:otherwise D:had happened