вставить правильный глагол 1) The engineers ... a new equipment in the office tomorrow.
а) will install б) install в) installed г) have installed
2) The engineers ... the new equipment for three days.
а) have been installing б) installed в) install г) had installed
3) A new laboratory ... last year/
а) were opened б) was opened в) opened г) had opened
4) I ... at the important project when the telephone rang.
а) worked б) had worked в) have been working г) was working
5) The new computer system ... at the moment.
а) is installed б) are installed в) is installing г) is being installing
6) Every material ... some resistance to the flow of an electric current through it.
а) is offering б) offered в) offers г) is being offered
7) The device ... the frequency of electromagnetic waves.
а) had calculated б) has calculated в) is calculated г) was calculated
8) A noise ... by the buzzer.
а) is being made б) makes в) made г) has made
9) The first integrated circuits ... during the early 1960s.
а) are made б) were made в) made г) make
10) Immediately after the First World War, electronic ... a push that then gained strength.
а) was receiving б) is received в) received г) has received
11) The ammeter ... to measure the current.
а) uses б) will used в) used г) is used
12) The receiver ... recently to illustrate the principle of molecular electronics.
а) developed б) develops в) has developed г) was developed
13) America ... the Moon surface during the 1960s.
а) gains б) was gained в) gained г) is gained
14) The student ... this experiment yesterday at 5 oclock.
а) is carrying out б) was carrying out в) has been carrying out г) had been carrying out
15) By the end of the year a large variety of semiconductor devices ... .
а) will have been produced б) will produce в) are produced г) are being produced
16) One ... always take safety precautions.
а) should б) may в) have г) is
17) A small change in the signal ... to produce a large change in the plate current.
а) can б) may в) is able г) have

oleh09156    2   19.12.2021 06:01    2