Robert is said _______ abroad, but I don’t know what country he studied in．

to have studied

to study

to be studying

to have been studying

In order to improve English, _______．

Jenny’s father bought her a lot of tapes

Jenny bought a lot of tapes for herself

a lot of tapes were bought by Jenny

a lot of tapes were bought by Jenny’s father

_______ late in the afternoon, Bob turned off the alarm．

To sleep

Sleeping

Sleep

Having

Let your mother know all the truth．She appears _______ everything．

to tell

to be told

to be telling

to have been told

_______ you the truth, I didn’t want to tell you about it．

To tell

Telling

To be told

Told

With a lot of difficult problems _______ ,the newly-elected president is having a hard time．

settled

settling

to settle

being settled

In order to make our city green, _______．

it is necessary to have planted more tree

many more trees need to plant

our city needs more tree

we must plant more trees

In some parts of London, missing a bus means _______ for another hour．

waiting

to wait

wait

to be waiting

In order to gain a bigger share in the international market, many state-run companies are striving _______ their product more competitive．

to make

making

to have made

having made

It is said that in Australia there is more land than the government knows _______．

it what to do with

what to do it with

what to do with it

to do what with it