1. Be careful with paint. It ____ a certain amount of lead.
А. Contains
Б. Is containing
В. Has contained
Г. Contained
2.When Mary came back, she looked very red from the sun. She ____ in the sun too long.
А. Had been lying
Б. Was lying
В. Had lain
Г. lay
3. There was nothing ____, but to wait for the next train which was due at six.
А. To do
Б. To be done
В. To be doing
Г. To have been doing

1 - a (по сути своей содержит свинец), 2 - в (сгорела на солнце прежде, чем прийти), 3 - a (устойчивое выражение)