However, at times this balance in nature is ______, resulting in a number of unforeseen effects.
| A．troubled | B．disturbed | C．confused | D．Puzzled |
Maria is fond of all kinds of sports, but she likes swimming ________.
| A．in practice | B．in general | C．in fact | D．in particular |
The other day Cathy was walking along the Broad Street when she ________ an old friend of
hers, one she hadn’t seen for a long time.
| A．came across | B．came up | C．came about | D．came out |
—Can I go to the cinema with you, Daddy?
—Sorry, my darling, but the film is _________ for adults only.
| A．admitted | B．intended | C．promised | D．permitted |
Much to ________ surprise of the students, the concert which was held once a year turned out to be ________ complete failure.
| A．/; a | B．the; a | C．the; / | D．/; / |
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．when |